I need a tranny - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Hoffman65burb · 01-11-2010, 09:35 PM

Hey,

In my jim i have a 454 with a 4 speed granny LOW with a np205 and 373 12 bolt axles. Down the highway with 37 inch tires, Im at about 2800 doing 80 KM's... I really dont need the low gear since I dont wheel the truck that often so im just looking for some better fuel economy and so I can go abit faster on the highway. I really dont want to change hte gearing in my differential. What kind of 5 speed transmissions are out there? Would this solve my problem? I have a 700R4, but whats the fun in that

, and i already have a new clutch kit in this beast.

thanks
-Rhys

Pyrotechnic · 01-11-2010, 10:13 PM

An NV4500 conversion would be your best bet. It's a much like the SM465 you have, but with a 5th gear that's overdrive. It's tough enough to handle a 454.

Hoffman65burb · 01-11-2010, 10:23 PM

Yea i was looking at nv4500, id love to get my hands on one. Impossible to find! i found one the other day but 2 grand? way out of my budget, any cheaper alternative?

gchemist · 01-11-2010, 10:35 PM

If you don't abuse it or tow over 5000 lbs, a NV3500 will survive. You can easy rebuilt one yourself.

TwoFiftyShifter · 01-11-2010, 10:46 PM

What is 80 kmh? I only know mph, but with thos tires and rear end 2800 rpm should be at least 60mph.... 2800 rpm is the sweet spot on the highway if its hilly too.

Hoffman65burb · 01-11-2010, 11:02 PM

80km's is 50 miles

munger · 01-11-2010, 11:16 PM

a nv4500/3500 or ranger overdrive giving you 8 gears and about the same money as a good nv4500

b454rat · 01-11-2010, 11:20 PM

You should be turning less Rs than that at 50 mph. I have close to the same setup as you but with 35s and 4.10s, turning about 2800 at 70. Check this site out, good info for gears and such...www.4lo.com.

3r!c84 · 01-11-2010, 11:21 PM

Hoffman65burb: I have a 700R4, but whats the fun in that

yeah your right you should let me have it then

b454rat · 01-11-2010, 11:22 PM

Is that a block I see IN THE FRONT AXLE?!?!?

3r!c84 · 01-11-2010, 11:24 PM

yes,,

Chlsnk · 01-11-2010, 11:38 PM

Not to get off topic but what does your rear window sticker mean it sure looks like a cool design. And your truck is so clean!

bikes&bowties · 01-11-2010, 11:43 PM

Quote:

Originally Posted by Chlsnk

Not to get off topic but what does your rear window sticker mean it sure looks like a cool design. And your truck is so clean!

its a board company...

Hoffman65burb · 01-12-2010, 01:12 AM

Quote:

Originally Posted by b454rat

You should be turning less Rs than that at 50 mph. I have close to the same setup as you but with 35s and 4.10s, turning about 2800 at 70. Check this site out, good info for gears and such...www.4lo.com.

im not 100% sure that its a 373 since my glove box sais that. So uncomfortable for me and my wallet on the highway

Around town its great, picks up real quick.

Quote:

Originally Posted by b454rat

Is that a block I see IN THE FRONT AXLE?!?!?

hahaha, just till i can afford some 35's, was just to clear the 37's to play in the mud abit

it was a 4 inch lift with 33's, gonna get some 35's on those slotted mags and back to a 4 inch lift, just $$ is the problem.

picked these 37's on 15x10 steels with 30% tread for 200$!

too much fun!

Hoffman65burb · 01-12-2010, 01:37 AM

Quote:

Originally Posted by 3r!c84

Hoffman65burb: I have a 700R4, but whats the fun in that

yeah your right you should let me have it then

Lol im sellin it if you want it

TwoFiftyShifter · 01-12-2010, 01:41 AM

You can only get halfway decent mpg with a lift, big tires and an old truck. If your getting low teens there is no room for improvement imo.

Hoffman65burb · 01-12-2010, 03:04 AM

Well i was looking at a rochester carb, as long as i stay OUT of the secondarys (which is very hard since that sound makes me smile downstairs), it actually gets pretty good milage in town lol, the primarys are really small!

Hoffman65burb · 01-14-2010, 04:07 AM

Well i picked up a low k nv3500 for 300, I really want to take the housing off and clean the inside, i see some dirt has gotten in. Anyone have a diagram / reference they wouldent mind sharing? i really dont want to screw around with this too much!

dan76 · 01-14-2010, 11:55 AM

Try these folks. You have to drill into the site, but they provide good diagrams and rebuild kits.

http://www.motivegear.com/

68 TT · 01-14-2010, 01:33 PM

Quote:

Originally Posted by Hoffman65burb

Hey,

In my jim i have a 454 with a 4 speed granny LOW with a np205 and 373 12 bolt axles. Down the highway with 37 inch tires, Im at about 2800 doing 80 KM's... I really dont need the low gear since I dont wheel the truck that often so im just looking for some better fuel economy and so I can go abit faster on the highway. I really dont want to change hte gearing in my differential. What kind of 5 speed transmissions are out there? Would this solve my problem? I have a 700R4, but whats the fun in that

, and i already have a new clutch kit in this beast.

thanks
-Rhys

You definitely have much more gear than 3.73's. By the RPM you are turning you have 6.20 something gears. Or you are stuck in low range in the transfer case with 3.08 gears. Nothing else adds up gearing and tire size wise.

That NV3500 won't last long with a big block and 37" tires in something that gets used off road. I broke one in a friends Jeep with 33" tires and a six cylinder this summer doing just one power shift.

Hoffman65burb · 01-14-2010, 09:15 PM

Quote:

Originally Posted by 68 TT

That NV3500 won't last long with a big block and 37" tires in something that gets used off road. I broke one in a friends Jeep with 33" tires and a six cylinder this summer doing just one power shift.

I barley ever wheel the truck right now, putting my old 33's back on soon, how long do you think this would last? Any way I can build this tranny stronger?

Hoods69BadBowTie · 01-14-2010, 09:30 PM

I would check your gearing out that just don't add up man. Those nv3500s don't hold up to much abuse my buddy was running a pretty stock SB and 33"s he broke his like the 3rd time he took it out just messing around nothing to hardcore. Let alone you want to turn 35"s and a BB in front.

TwoFiftyShifter · 01-14-2010, 09:51 PM

You have to have 5.13s. I don't even thinbk that could have come in a 1/2 ton.... It just doesnt add up.

68 TT · 01-15-2010, 12:30 PM

Quote:

Originally Posted by TwoFiftyShifter

You have to have 5.13s. I don't even thinbk that could have come in a 1/2 ton.... It just doesnt add up.

I have 5.13's and just under 32" tires with the same SM465 and NP205 he is running and at the same 80 kph I am right at 2700 rpm.

With his 37" tires he would be at just over 2300 rpm at the same speed.

He either has gears I don't think they make for the 12-bolt (something about 6.20 gears) or he has 3.08 gears and the transfer case is in four low.

Nothing else adds up.

TwoFiftyShifter · 01-15-2010, 06:11 PM

I'm glad I have 3.42s!

01-11-2010, 09:35 PM	#1
Hoffman65burb Registered User Join Date: Jul 2008 Location: Vancouver BC Posts: 448	I need a tranny Hey, In my jim i have a 454 with a 4 speed granny LOW with a np205 and 373 12 bolt axles. Down the highway with 37 inch tires, Im at about 2800 doing 80 KM's... I really dont need the low gear since I dont wheel the truck that often so im just looking for some better fuel economy and so I can go abit faster on the highway. I really dont want to change hte gearing in my differential. What kind of 5 speed transmissions are out there? Would this solve my problem? I have a 700R4, but whats the fun in that , and i already have a new clutch kit in this beast. thanks -Rhys __________________ 1978 GMC Jimmy 454bbc Turbo400 NP205 3.73 gears 4inch lift 33's

01-11-2010, 10:13 PM	#2
Pyrotechnic Registered User Join Date: Feb 2007 Location: Austin, TX Posts: 3,930	Re: I need a tranny An NV4500 conversion would be your best bet. It's a much like the SM465 you have, but with a 5th gear that's overdrive. It's tough enough to handle a 454. __________________ 1977 GMC Sierra Grande

01-11-2010, 10:23 PM	#3
Hoffman65burb Registered User Join Date: Jul 2008 Location: Vancouver BC Posts: 448	Re: I need a tranny Yea i was looking at nv4500, id love to get my hands on one. Impossible to find! i found one the other day but 2 grand? way out of my budget, any cheaper alternative? __________________ 1978 GMC Jimmy 454bbc Turbo400 NP205 3.73 gears 4inch lift 33's

01-11-2010, 10:35 PM	#4
gchemist BAD BOW-Silverado XST Join Date: May 2000 Location: Senior Member from Austin, TX Posts: 6,431	Re: I need a tranny If you don't abuse it or tow over 5000 lbs, a NV3500 will survive. You can easy rebuilt one yourself. __________________ Gerardo a.k.a. Mad Chemist Silverado XST videos

01-11-2010, 10:46 PM	#5
TwoFiftyShifter Registered User Join Date: Nov 2008 Location: Gwinnett GA Posts: 1,803	Re: I need a tranny What is 80 kmh? I only know mph, but with thos tires and rear end 2800 rpm should be at least 60mph.... 2800 rpm is the sweet spot on the highway if its hilly too. __________________ 1982 K10 SWB 1987 V20 - Sold - Doh!

01-11-2010, 11:02 PM	#6
Hoffman65burb Registered User Join Date: Jul 2008 Location: Vancouver BC Posts: 448	Re: I need a tranny 80km's is 50 miles __________________ 1978 GMC Jimmy 454bbc Turbo400 NP205 3.73 gears 4inch lift 33's

01-11-2010, 11:16 PM	#7
munger Registered User Join Date: Nov 2009 Location: goodland,ks Posts: 217	Re: I need a tranny a nv4500/3500 or ranger overdrive giving you 8 gears and about the same money as a good nv4500

01-11-2010, 11:20 PM	#8
b454rat Senior Member Join Date: May 2004 Location: Binghamton, NY Posts: 3,454	Re: I need a tranny You should be turning less Rs than that at 50 mph. I have close to the same setup as you but with 35s and 4.10s, turning about 2800 at 70. Check this site out, good info for gears and such...www.4lo.com. __________________ 2000 GMC CCSB 454/4L80 6” lift SAS 1999 Chevy CCSB 454/NV4500 6” lift 1999 GMC Yukon 350/4L60 4" SAS Last edited by b454rat; 01-11-2010 at 11:21 PM.

01-11-2010, 11:21 PM	#9
3r!c84 Badass Join Date: Jan 2009 Location: lox. fl Posts: 4,586	Re: I need a tranny Hoffman65burb: I have a 700R4, but whats the fun in that yeah your right you should let me have it then __________________ Think outside the box? -84c10 (1stcar)→My Build← -00 Saturn 5spd drop a gear and disappear! 1/4:13:90

01-11-2010, 11:22 PM	#10
b454rat Senior Member Join Date: May 2004 Location: Binghamton, NY Posts: 3,454	Re: I need a tranny Is that a block I see IN THE FRONT AXLE?!?!? __________________ 2000 GMC CCSB 454/4L80 6” lift SAS 1999 Chevy CCSB 454/NV4500 6” lift 1999 GMC Yukon 350/4L60 4" SAS

01-11-2010, 11:24 PM	#11
3r!c84 Badass Join Date: Jan 2009 Location: lox. fl Posts: 4,586	Re: I need a tranny yes,, __________________ Think outside the box? -84c10 (1stcar)→My Build← -00 Saturn 5spd drop a gear and disappear! 1/4:13:90

01-11-2010, 11:38 PM	#12
Chlsnk Registered User Join Date: Jan 2009 Location: Kansas city Posts: 756	Re: I need a tranny Not to get off topic but what does your rear window sticker mean it sure looks like a cool design. And your truck is so clean! __________________ *My 84 short bed build up*** http://67-72chevytrucks.com/vboard/s...68#post3481968

01-12-2010, 01:41 AM	#16
TwoFiftyShifter Registered User Join Date: Nov 2008 Location: Gwinnett GA Posts: 1,803	Re: I need a tranny You can only get halfway decent mpg with a lift, big tires and an old truck. If your getting low teens there is no room for improvement imo. __________________ 1982 K10 SWB 1987 V20 - Sold - Doh!

01-12-2010, 03:04 AM	#17
Hoffman65burb Registered User Join Date: Jul 2008 Location: Vancouver BC Posts: 448	Re: I need a tranny Well i was looking at a rochester carb, as long as i stay OUT of the secondarys (which is very hard since that sound makes me smile downstairs), it actually gets pretty good milage in town lol, the primarys are really small! __________________ 1978 GMC Jimmy 454bbc Turbo400 NP205 3.73 gears 4inch lift 33's

01-14-2010, 04:07 AM	#18
Hoffman65burb Registered User Join Date: Jul 2008 Location: Vancouver BC Posts: 448	Re: I need a tranny Well i picked up a low k nv3500 for 300, I really want to take the housing off and clean the inside, i see some dirt has gotten in. Anyone have a diagram / reference they wouldent mind sharing? i really dont want to screw around with this too much! __________________ 1978 GMC Jimmy 454bbc Turbo400 NP205 3.73 gears 4inch lift 33's



Register or Log In To remove these advertisements.

01-14-2010, 11:55 AM	#19
dan76 Registered User Join Date: Mar 2008 Location: Salt Lake City UT Posts: 441	Re: I need a tranny Try these folks. You have to drill into the site, but they provide good diagrams and rebuild kits. http://www.motivegear.com/ Last edited by dan76; 01-14-2010 at 11:55 AM. Reason: clarity

01-14-2010, 09:30 PM	#22
Hoods69BadBowTie Chevys Kick A$$ Join Date: Jan 2005 Location: Zootown, MT Posts: 12,699	Re: I need a tranny I would check your gearing out that just don't add up man. Those nv3500s don't hold up to much abuse my buddy was running a pretty stock SB and 33"s he broke his like the 3rd time he took it out just messing around nothing to hardcore. Let alone you want to turn 35"s and a BB in front. __________________ HOODS is what I answer too -'79, '77, '88 Pickup Sold, '85 Camaro, '83 T/A, '81,'83,'90 K5 Blazer All Sold -'79 3/4 ton "Big Yellow Bananna" Lifted 4spd. 39.5 TSL Swampers, The money Pit -'86 K5 Blazer Silverado 6.2 4" lift 35"s -'95 Ext. Cab Shorty 4" Tuff Country rolling 35" M/T's -'83 Monte Carlo T-Tops. 126,500 Original Miles -LATER I would rather push a Chevy then drive a ford!! Last edited by Hoods69BadBowTie; 01-14-2010 at 09:31 PM.

01-14-2010, 09:51 PM	#23
TwoFiftyShifter Registered User Join Date: Nov 2008 Location: Gwinnett GA Posts: 1,803	Re: I need a tranny You have to have 5.13s. I don't even thinbk that could have come in a 1/2 ton.... It just doesnt add up. __________________ 1982 K10 SWB 1987 V20 - Sold - Doh!

01-15-2010, 06:11 PM	#25
TwoFiftyShifter Registered User Join Date: Nov 2008 Location: Gwinnett GA Posts: 1,803	Re: I need a tranny I'm glad I have 3.42s! __________________ 1982 K10 SWB 1987 V20 - Sold - Doh!

Register or Log In To remove these advertisements.