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#1 |
Chemist under the hood...
Join Date: Apr 2009
Location: Fort Erie,ON, Canada
Posts: 617
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Dumb question 3 or 4 Speed Muncie
Ok, in my GMC 910 (which is like a C10), I have a mystery motor that I think is a 283 V8. According to the VIN, it should have had a I-6. It also had a column shift replaced with a floor shift. Anyway, I put a new speedometer cable and red 21 tooth driven gear on tonight to get the speedometer to work (and it does yay!). While under the truck in the rain, I could actually see the casting numbers on the transmission. It was 3857584GM and another number is 3851325. A quick websearch says that this is a 4 speed transmission? I can only find three forward gears while driving and reverse is ok. The floor shift pattern is also a little strange Reverse all the way left and forward, 1st straight down but a little to the right, second over left and straight up and third straight down.
Does this sound right or is there a missing gear somewhere?? I feel stupid asking!! ![]()
__________________
Current fleet: 2013 GMC Sierra, 5.3L, 4x4 1988 GMC Sierra, 305, Auto 1984 Jeep Grand Wagoneer, 360 V8 1997 VW Cabrio, 2.0L 2017 Toyota Rav4, 2.5L Stuff I wish I still had: 2013 Toyota Matrix [RIP] 1967 GMC 910 Fleetside, 283 V8 [1st Love-SOLD] 1987 Jeep Cherokee Laredo 4X4, 4.0 I-6 [SOLD} 1994 Chevrolet Caprice Classic, 5.7LV8 [SOLD] 1995 Chevrolet Astro AWD, 4.3L V6 (RIP) 1998 Chevrolet Suburban 4x4, 5.7L V8 [SOLD] |
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#2 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Dumb question 3 or 4 Speed Muncie
sounds like a 3 speed to me.
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#3 |
Registered User
Join Date: Nov 2008
Location: Carmel, IN
Posts: 187
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Re: Dumb question 3 or 4 Speed Muncie
my 67 4 speed is
...1 3 R 2 4 Last edited by Elephanthead; 04-20-2009 at 09:57 PM. |
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#4 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,858
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Re: Dumb question 3 or 4 Speed Muncie
Second over right,correct?Not over left,right?
__________________
"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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#5 |
Chemist under the hood...
Join Date: Apr 2009
Location: Fort Erie,ON, Canada
Posts: 617
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Re: Dumb question 3 or 4 Speed Muncie
Yes-Sorry, Second over right, Third straight down from Second.
R 2 1 3
__________________
Current fleet: 2013 GMC Sierra, 5.3L, 4x4 1988 GMC Sierra, 305, Auto 1984 Jeep Grand Wagoneer, 360 V8 1997 VW Cabrio, 2.0L 2017 Toyota Rav4, 2.5L Stuff I wish I still had: 2013 Toyota Matrix [RIP] 1967 GMC 910 Fleetside, 283 V8 [1st Love-SOLD] 1987 Jeep Cherokee Laredo 4X4, 4.0 I-6 [SOLD} 1994 Chevrolet Caprice Classic, 5.7LV8 [SOLD] 1995 Chevrolet Astro AWD, 4.3L V6 (RIP) 1998 Chevrolet Suburban 4x4, 5.7L V8 [SOLD] |
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#6 |
Registered User
![]() Join Date: Dec 2008
Location: K.C. Missouri
Posts: 1,024
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Re: Dumb question 3 or 4 Speed Muncie
While you were looking did you count the shifter levers? or more importantly the shafts that they bolt too?
Two shifter "bolts" or shafts = 3 speed Three " " '" " " " " = 4 speed the extra one will be right in front of where your speeo cable hooks up on the tail shaft. |
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#7 |
Chemist under the hood...
Join Date: Apr 2009
Location: Fort Erie,ON, Canada
Posts: 617
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Re: Dumb question 3 or 4 Speed Muncie
I'll try to get a picture tomorrow. I'm just getting a grasp of all that this truck has but it would be nice if it had a 4th gear. Third seems to rev pretty high at 50MPH for me (don't have a TACH either).
__________________
Current fleet: 2013 GMC Sierra, 5.3L, 4x4 1988 GMC Sierra, 305, Auto 1984 Jeep Grand Wagoneer, 360 V8 1997 VW Cabrio, 2.0L 2017 Toyota Rav4, 2.5L Stuff I wish I still had: 2013 Toyota Matrix [RIP] 1967 GMC 910 Fleetside, 283 V8 [1st Love-SOLD] 1987 Jeep Cherokee Laredo 4X4, 4.0 I-6 [SOLD} 1994 Chevrolet Caprice Classic, 5.7LV8 [SOLD] 1995 Chevrolet Astro AWD, 4.3L V6 (RIP) 1998 Chevrolet Suburban 4x4, 5.7L V8 [SOLD] |
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#8 |
Registered User
![]() Join Date: Dec 2008
Location: K.C. Missouri
Posts: 1,024
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Re: Dumb question 3 or 4 Speed Muncie
three speed:
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#9 |
Registered User
Join Date: Apr 2007
Location: King City, Ontario, Canada
Posts: 974
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Re: Dumb question 3 or 4 Speed Muncie
dont know about down where you are, but here it was mightly cold and rainy to be doing work on the ground under your truck! props for that..
..and it all seems to ad up to a three speed... can the 3spd and 4 spd cases be interchanged? possibly somebody took the guts of one and put it in another case? just throwing it out there i dont really know much about standards ![]()
__________________
- Jason If you can turn, Youre not going fast enough. Favorite caption: first car to 200 mph in the 1/4 mile, no parachute, drum brakes all the way around.. ..back when men were men. |
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#10 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Dumb question 3 or 4 Speed Muncie
it doesn't matter if your truck is a 2 speed, 3 speed, or a 4 speed. They all have a 1 to 1 final gear ratio.
In otherwords, if you have a 4 speed, you'd be ravin just as high as if you had a 3 speed. To drop your RPMs you need either a rear axle gear ratio swap, or an over drive tranny. |
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#11 | |
Registered User
![]() Join Date: Dec 2008
Location: K.C. Missouri
Posts: 1,024
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Re: Dumb question 3 or 4 Speed Muncie
Quote:
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#12 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,858
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Re: Dumb question 3 or 4 Speed Muncie
I`d be ravin`,too.(about how high it was revvin`)
![]() Man,am I askin`for it.Relax guys,he knows am justa keedin`.
__________________
"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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#13 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Dumb question 3 or 4 Speed Muncie
you got me Tim!
Ravin, revin, what ever. ![]() There's a reason I hardly ever get on ppl for typing skills |
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#14 |
Chemist under the hood...
Join Date: Apr 2009
Location: Fort Erie,ON, Canada
Posts: 617
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Re: Dumb question 3 or 4 Speed Muncie
Actually, Longhorn man just solved my problem. If the final gear is 1:1 then it is really the back end that needs work. I get up to the third gear with no issues so really, I need a higher gear ratio in the back.
Great points from all. Jason
__________________
Current fleet: 2013 GMC Sierra, 5.3L, 4x4 1988 GMC Sierra, 305, Auto 1984 Jeep Grand Wagoneer, 360 V8 1997 VW Cabrio, 2.0L 2017 Toyota Rav4, 2.5L Stuff I wish I still had: 2013 Toyota Matrix [RIP] 1967 GMC 910 Fleetside, 283 V8 [1st Love-SOLD] 1987 Jeep Cherokee Laredo 4X4, 4.0 I-6 [SOLD} 1994 Chevrolet Caprice Classic, 5.7LV8 [SOLD] 1995 Chevrolet Astro AWD, 4.3L V6 (RIP) 1998 Chevrolet Suburban 4x4, 5.7L V8 [SOLD] |
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#15 |
Future TOTM Winner
Join Date: Aug 2006
Location: Bulverde, TX
Posts: 2,692
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Re: Dumb question 3 or 4 Speed Muncie
According to this, you at least have a 4 speed tail housing. I couldn't find anything saying that the identical tail housing was used on both the 3 and 4 speeds. But the year model could make it correct for your truck assuming the tail housings were interchangeable.
http://www.5speeds.com/casting.html I’m betting you have the original 3 speed. I doubt someone would take the time to put in a 4 speed but not get a shifter for it to work properly. However, if for some reason that is the case and you are stuck in 3rd gear of a 4 speed, then it would DEFINITLY be beneficial to your RPMs to find 4th gear. While finding an additional gear would be cool, from the way you described your shift pattern, I’m betting it’s a three speed like others have said.
__________________
72 Chevy CST K5 HIGHLANDER BLAZER Getting a 6.0,NV4500,NP205,14BFF (Currently laying all over the place in little pieces) 72 Chevy swb step-side "LS" 6.0 Here's a build thread of sorts 2002 HD2500 Crew Cab, 8.1L Allison 4x4 Daily Driver Check it out www.lsdyno.com |
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#16 |
Chemist under the hood...
Join Date: Apr 2009
Location: Fort Erie,ON, Canada
Posts: 617
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Re: Dumb question 3 or 4 Speed Muncie
Yeah-a 4-speed seems to be just a dream! The original I-6 would have had a three speed so mabye the PO just switched the engine to 283 and left the 3-speed. It was a farm truck for use in apple/peach orchards so probably wasn't ever going to go too fast. I still have to find the numbers for the rear-end to see what the gear ratio is.
Thanks for your reply.
__________________
Current fleet: 2013 GMC Sierra, 5.3L, 4x4 1988 GMC Sierra, 305, Auto 1984 Jeep Grand Wagoneer, 360 V8 1997 VW Cabrio, 2.0L 2017 Toyota Rav4, 2.5L Stuff I wish I still had: 2013 Toyota Matrix [RIP] 1967 GMC 910 Fleetside, 283 V8 [1st Love-SOLD] 1987 Jeep Cherokee Laredo 4X4, 4.0 I-6 [SOLD} 1994 Chevrolet Caprice Classic, 5.7LV8 [SOLD] 1995 Chevrolet Astro AWD, 4.3L V6 (RIP) 1998 Chevrolet Suburban 4x4, 5.7L V8 [SOLD] |
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#17 | |
Chemist under the hood...
Join Date: Apr 2009
Location: Fort Erie,ON, Canada
Posts: 617
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![]() Quote:
R 1 3 2 4 How dumb I was. I was going from R to 2, then 3 and 4 (always not starting in first). I think my transmission must be worn because you have to hunt for 1st and it's way too easy to go into 3 and miss 1. Feel kind of foolish but I guess you always learn something from these trucks. Have a great day and thanks for all the help. Starting on the drum brakes all around this week. Got all the parts.
__________________
Current fleet: 2013 GMC Sierra, 5.3L, 4x4 1988 GMC Sierra, 305, Auto 1984 Jeep Grand Wagoneer, 360 V8 1997 VW Cabrio, 2.0L 2017 Toyota Rav4, 2.5L Stuff I wish I still had: 2013 Toyota Matrix [RIP] 1967 GMC 910 Fleetside, 283 V8 [1st Love-SOLD] 1987 Jeep Cherokee Laredo 4X4, 4.0 I-6 [SOLD} 1994 Chevrolet Caprice Classic, 5.7LV8 [SOLD] 1995 Chevrolet Astro AWD, 4.3L V6 (RIP) 1998 Chevrolet Suburban 4x4, 5.7L V8 [SOLD] |
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#18 |
I am a Referee of life.
Join Date: Jun 2000
Location: Greensboro N.C.
Posts: 13,993
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Re: Dumb question 3 or 4 Speed Muncie
And first was way lower than the second you thought was first so you still rev high on the hiway.A rear gear change will make it better but you probably have a 3:73 ratio and changing to a 3:08/3:07 will be too much.Larger diameter tires in the rear may help some but will probably not be a cure all.The ultimate set-up is possibly a Gear vendors over/under drive unit but you really better be sitting down and maybe have medical staff standing by when you price one.
__________________
The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil" Last edited by PanelDeland; 05-31-2009 at 11:53 AM. |
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#19 |
Registered User
![]() Join Date: Dec 2008
Location: K.C. Missouri
Posts: 1,024
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Re: Dumb question 3 or 4 Speed Muncie
your tranny may be alright, the old 4 speeds are tough to wear out. I would look at the shifter first, I had to rebuild the one on the three speed that I posted earlier. I went to ace harware, and bought teflon bushings in the right outside/ inside diameter and ground them down to the right thickness. cost about 3.oo.
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#20 | |
Chemist under the hood...
Join Date: Apr 2009
Location: Fort Erie,ON, Canada
Posts: 617
|
Re: Dumb question 3 or 4 Speed Muncie
Quote:
Nothing by itself seems too expensive but by the time you get it all together plus grease, brake cleaner, fluid, coolant, oil, etc. Man!! ![]()
__________________
Current fleet: 2013 GMC Sierra, 5.3L, 4x4 1988 GMC Sierra, 305, Auto 1984 Jeep Grand Wagoneer, 360 V8 1997 VW Cabrio, 2.0L 2017 Toyota Rav4, 2.5L Stuff I wish I still had: 2013 Toyota Matrix [RIP] 1967 GMC 910 Fleetside, 283 V8 [1st Love-SOLD] 1987 Jeep Cherokee Laredo 4X4, 4.0 I-6 [SOLD} 1994 Chevrolet Caprice Classic, 5.7LV8 [SOLD] 1995 Chevrolet Astro AWD, 4.3L V6 (RIP) 1998 Chevrolet Suburban 4x4, 5.7L V8 [SOLD] |
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#21 |
It's all in the timing
Join Date: May 2009
Location: Lake Mary,Florida
Posts: 600
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Re: Dumb question 3 or 4 Speed Muncie
If reverse is left and up,1st straight down,2nd over right and up,and 3rd straight down from 2nd.I wouuld say that is a 3 speed.Have same pattern on my 3 speed
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#22 |
Chemist under the hood...
Join Date: Apr 2009
Location: Fort Erie,ON, Canada
Posts: 617
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Re: Dumb question 3 or 4 Speed Muncie
No, Reverse is left and up, First is right and up, 2nd straight down, third right and up and fourth straight down. Hard to make the picture:
R--1--3 ---2--4
__________________
Current fleet: 2013 GMC Sierra, 5.3L, 4x4 1988 GMC Sierra, 305, Auto 1984 Jeep Grand Wagoneer, 360 V8 1997 VW Cabrio, 2.0L 2017 Toyota Rav4, 2.5L Stuff I wish I still had: 2013 Toyota Matrix [RIP] 1967 GMC 910 Fleetside, 283 V8 [1st Love-SOLD] 1987 Jeep Cherokee Laredo 4X4, 4.0 I-6 [SOLD} 1994 Chevrolet Caprice Classic, 5.7LV8 [SOLD] 1995 Chevrolet Astro AWD, 4.3L V6 (RIP) 1998 Chevrolet Suburban 4x4, 5.7L V8 [SOLD] |
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#23 |
It's all in the timing
Join Date: May 2009
Location: Lake Mary,Florida
Posts: 600
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Re: Dumb question 3 or 4 Speed Muncie
well at least you know its a 4 speed.
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#24 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,858
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Re: Dumb question 3 or 4 Speed Muncie
That`s cool to know!It sounds like the ****er is worn,making gear location hard to find.You may find a 3.08 ratio will work fine for you.Figure your 1st will be lower than a 3 spd.Also,you may have a 4.10 rear.
__________________
"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ Last edited by special-K; 06-01-2009 at 05:18 AM. |
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