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#1 | |
But Found Her 25yrs Later!
![]() Join Date: Oct 2010
Location: Oregon City, Oregon
Posts: 10,525
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Re: 4 speed w/granny gear...lets talk...
Quote:
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I lost my 65 - Found it 25 years later: http://67-72chevytrucks.com/vboard/s...d.php?t=426650 66 C20 Service Truck: http://67-72chevytrucks.com/vboard/s...d.php?t=428035 |
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#2 |
What?
Join Date: Jun 2007
Location: Southern California
Posts: 7,617
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Re: 4 speed w/granny gear...lets talk...
I absolutely love the SM465 4 speeds with the low first gear!
Put my burb into 4 low, lock the hubs, then slip into first gear on a very steep dirt trail and it will crawl up by it's self as I walk outside next to it nudging the steering wheel through the open window! All this happens while at idle speed of about 800 RPM. (Funny, my Dad demonstrated this to me when I was kid). The sound of the 327 and all the gears, from the 4.57 axles, SM465 1'st gear, and Rockwell T-221 Transfer case... Music to my ears and always puts a grin on my face. Glad you got your engine tuned right, and now you can realize the full potentials of your truck in it's current configuration.
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Chris 1968 K20 Suburban 1972 K10 LWB PU |
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#3 |
Vintage 4x4s
Join Date: Sep 2010
Location: Prior Lake, MN
Posts: 4,305
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Re: 4 speed w/granny gear...lets talk...
I'm assuming the 67 GMC 4 spd has to be the SM420? Looks like it has the following ratios:
SM465 SM420 1st- 6.55 7.06 2nd- 3.58 3.58 3rd- 1.57 1.72 4th- 1.0 1.0 Thoughts on the SM 420 behind the 305 V6 in the GMC I'm getting? Plan to restore it and use it to lug a few trailers around but no serious mileage at all. With the torque of the big block V6 it should work pretty good with wide ratio?
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67 GMC K1500 Custom- 305V6 SM420, PTO, Ram Assist, yellow (the outcast) (project period correct upgrades) 67 GMC C2500 351V6 TH400, AC, PS, PB (can't decide what to do with. Update, decided to keep and will restore ![]() 86 CHV K30 502 th400, apple red NEW 71 CHV K20 350 SM465, ochre (saved work truck) 71 CHV K20 292 SM465, white, tach, PTO, (future project) 72 CHV K20 350 350th, medium blue (project stocker) 01 CHV K2500hd crew, indigo blue ^3 dont run and the others don't see winter either '86 K30 Cummins "Fireside" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=649649 '71 K20 "get driveable" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=590642 '72 K20 Build Thread: http://67-72chevytrucks.com/vboard/s...=493477&page=6 Last edited by Vintage Windmills; 01-26-2011 at 11:12 PM. |
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#4 | |
But Found Her 25yrs Later!
![]() Join Date: Oct 2010
Location: Oregon City, Oregon
Posts: 10,525
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Re: 4 speed w/granny gear...lets talk...
Quote:
It looks as though the SM420 has a wider gap between 3rd and 4th.
__________________
I lost my 65 - Found it 25 years later: http://67-72chevytrucks.com/vboard/s...d.php?t=426650 66 C20 Service Truck: http://67-72chevytrucks.com/vboard/s...d.php?t=428035 |
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#5 |
Registered User
Join Date: Dec 2009
Location: Ste. Genevieve, MO
Posts: 526
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Re: 4 speed w/granny gear...lets talk...
You gotta love that granny low, trust me when you get into a situation where theres a kid in a 98 f150 and hes saying your truck doesnt have any balls.....trust me it all pays of in the end.
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#6 |
Registered User
Join Date: Dec 2009
Location: Ste. Genevieve, MO
Posts: 526
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Re: 4 speed w/granny gear...lets talk...
Lol found the vid of that truck pull...sorry bout the quality....
250 inline 4 speed granny low 4.57 rear end gives an a** whoopin ![]() |
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#7 |
Registered User
Join Date: Dec 2008
Location: Ashland, KY
Posts: 700
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Re: 4 speed w/granny gear...lets talk...
OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO BBBBBBBBBBBBBBOOOOOOOOOOOOOOOOOYYYYYYYYYYYYYYYYYYY! Wow that makes me very happy!
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68 C10 LWB 2/4 drop 406/th400/3.73posi 04 Silverado SS LQ9 6.0/4L65e/4.11posi AWD |
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#8 |
Senior Member
Join Date: Jul 2004
Location: Clarks Hill, Indiana
Posts: 733
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Re: 4 speed w/granny gear...lets talk...
about the only time i use 1st, is when i have a load in the bed, or pulling a trailer or a truck on the tow bar. and it's not that i need to use 1st, but i know it's easier on the clutch to use 1st.
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1969 K10 - V8, 465, 205, 12 bolt, D44 2002-current 1969 K20 - V8, 465, 221, Eaton, D44 2012-current Nothin' but drums on all 4 corners! past horses in the stable 72 C10-short step (97-02), 68 C10-long fleet (06-12) |
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#9 |
Registered User
Join Date: Dec 2009
Location: Ste. Genevieve, MO
Posts: 526
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Re: 4 speed w/granny gear...lets talk...
lol I can start mine in first with the clutch out and giving it no gas....it just starts crawlin
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#10 | |
Senior Member
Join Date: Jul 2010
Location: South Dakota
Posts: 4,093
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Re: 4 speed w/granny gear...lets talk...
Quote:
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1969 Chevy c20(Miss Hackjob) |
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#11 |
Registered User
Join Date: Oct 2010
Location: everett washington
Posts: 382
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Re: 4 speed w/granny gear...lets talk...
I grew up driving a 1969 chevy c-30 with a 235? I-6 and a granny 4spd and 4-10s couldn't go over 60 in it or the motor would heat up (my oldest sister cooked 3 motors in it) I never had a problem with the spread. I grew up on a large family farm in Iowa and I rember taking that truck out to the pasture w/60-70 hay bales loaded on the flatbed putting it in 1st letting the clutch out. it would idle so slow that I could walk faster then the truck was moving, hopping on the bed and kicking bales off as it went down the pasture. at the end of the field I would hop off turn it around and did it again. In the winter my dad would get a front end loader bucket full of salt and sand onto the bed and that truck would go anywhare we wanted to go and punch threw snowdrifts higher than the truck lol
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a wise man once said "There are only two real rules to life... 1 - Don't sweat the small stuff 2 - Everything is small stuff |
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#12 |
Registered User
Join Date: Dec 2009
Location: Ste. Genevieve, MO
Posts: 526
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Re: 4 speed w/granny gear...lets talk...
Lol I can take off in 4th at dead stop to....God I love these trucks.....and I love showing up those cute little fords.
Last edited by bosco200; 01-27-2011 at 12:09 AM. |
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#13 |
Registered User
Join Date: Feb 2007
Location: Cali Central Coast
Posts: 5,191
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Re: 4 speed w/granny gear...lets talk...
This is an old thread, but it's great that so many guys have the old SM 465/420. They are just classic truck trannys and really fun to drive; like it has been said, you can lug them way down, and rev them fairly high; they are noisy and a little clunky compared to modern trannys, but they are purely functional beasts that are indestructible and give your truck a lot of personality. I always wanted one as a kid, and I don't think I'll ever change mine out, regardless of everything else I do. The cool factor is pretty high, IMO.
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'67 SWB Fleetside ZZ4/350/Tremec 5-speed/4link/Scott's IFS - and fun as heck! SOLD ![]() Click here to support the board Philippians 4: 6-7 |
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#14 |
But Found Her 25yrs Later!
![]() Join Date: Oct 2010
Location: Oregon City, Oregon
Posts: 10,525
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Re: 4 speed w/granny gear...lets talk...
What's the statute of limitations?
![]() I say no thread is too old for these old trucks. ![]()
__________________
I lost my 65 - Found it 25 years later: http://67-72chevytrucks.com/vboard/s...d.php?t=426650 66 C20 Service Truck: http://67-72chevytrucks.com/vboard/s...d.php?t=428035 |
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#15 |
Registered User
Join Date: Dec 2008
Location: Ashland, KY
Posts: 700
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Re: 4 speed w/granny gear...lets talk...
talk about walking beside it, put one down in Low Lock and 1st! id almost bet it would pull a house off its foundation! that low gear has gotten me outta some wild situations where there could be no roll back on a hill or stuck in the mud!
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68 C10 LWB 2/4 drop 406/th400/3.73posi 04 Silverado SS LQ9 6.0/4L65e/4.11posi AWD |
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#16 |
Junior Member
Join Date: Dec 2006
Location: Southeast Missouri
Posts: 2,436
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Re: 4 speed w/granny gear...lets talk...
One of these old 4 speeds is lot of fun behind a 454 with 3.73 gears.
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'67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E. |
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#17 |
But Found Her 25yrs Later!
![]() Join Date: Oct 2010
Location: Oregon City, Oregon
Posts: 10,525
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Re: 4 speed w/granny gear...lets talk...
I saw one of those sometime back.
It's a gearbox that bumps the ratios up. If I remember correctly, 4th is bumped up from 1:1 to 1:1.23 or something. It puts granny at a normal first ratio, and makes 4th like an overdrive.
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I lost my 65 - Found it 25 years later: http://67-72chevytrucks.com/vboard/s...d.php?t=426650 66 C20 Service Truck: http://67-72chevytrucks.com/vboard/s...d.php?t=428035 Last edited by LostMy65; 01-27-2011 at 03:35 PM. |
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#18 |
But Found Her 25yrs Later!
![]() Join Date: Oct 2010
Location: Oregon City, Oregon
Posts: 10,525
|
Re: 4 speed w/granny gear...lets talk...
__________________
I lost my 65 - Found it 25 years later: http://67-72chevytrucks.com/vboard/s...d.php?t=426650 66 C20 Service Truck: http://67-72chevytrucks.com/vboard/s...d.php?t=428035 Last edited by LostMy65; 01-27-2011 at 03:39 PM. |
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#19 |
Registered User
Join Date: Apr 2010
Location: So Cal
Posts: 1,438
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Re: 4 speed w/granny gear...lets talk...
It would cost you $3k for the gear vendors unit plus a driveshaft. you could put a NV4500 5spd for a lot less and have a better and lighter setup.
I'm not going to say I'm crazy about the SM465, but it is a whole lot better that a column shift 3 spd. My '67 had the all-syncro 3spd with 4.56 rear gears. I hated the column and hauling any real load was hard on the clutch. Getting it moving in 1st or reverse could get some clutch smell, especially a heavy load on a hill. I replaced the 3 spd with the SM465 and it was a lot better. I replaced the the 4.56 gears with 3.54 gears (original DANA) and it was then FANTASTIC. With 4.56 gears, I was in the slow lane with the engine screaming. With the 3.54 gears I am in the fast lane running 70-75 with little effort. It didn't loose any pulling power, it just does it faster. I added headers, OK. I rebuilt the engine, OK. This was days before the gear change, but the gears woke it up. I added P/ disc brakes, OK. I added P/steering, OK. I added AC, TERRIFIC. I love this old truck. Hands down, AC and taller rear gears are the best improvements I have made to this old truck.
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'67 GMC 2500, 292, 4spd, AC |
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#20 |
Registered User
Join Date: Jul 2010
Location: napa ca.
Posts: 199
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Re: 4 speed w/granny gear...lets talk...
sm 465 here, and i love it.
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#21 |
Registered User
Join Date: Aug 2009
Location: Red Deer, Alberta
Posts: 190
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Re: 4 speed w/granny gear...lets talk...
I was thinking of swapping mine out....but hearing everyone having so much fun I think I must be missing something? Maybe I should start pulling some fords around parking lots!!!
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"If you need to tell everyone how good you are - your probably not" |
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#22 |
Registered User
Join Date: Dec 2009
Location: Ste. Genevieve, MO
Posts: 526
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Re: 4 speed w/granny gear...lets talk...
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#23 | |
But Found Her 25yrs Later!
![]() Join Date: Oct 2010
Location: Oregon City, Oregon
Posts: 10,525
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Re: 4 speed w/granny gear...lets talk...
Quote:
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__________________
I lost my 65 - Found it 25 years later: http://67-72chevytrucks.com/vboard/s...d.php?t=426650 66 C20 Service Truck: http://67-72chevytrucks.com/vboard/s...d.php?t=428035 |
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#24 |
Registered User
Join Date: Jan 2011
Location: Owasso Ok
Posts: 5
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Re: 4 speed w/granny gear...lets talk...
This is random but im pretty sure my truck has the exact same setup as yours, i agree the transmission leaves much to be desired
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#25 |
Senior Member
Join Date: Jul 2010
Location: South Dakota
Posts: 4,093
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Re: 4 speed w/granny gear...lets talk...
To get it in first some times ill let out the clutch a bit then push it back in and wait a sec then try to put it in, works everytime. These things are great
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1969 Chevy c20(Miss Hackjob) |
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