5-SPEED transmission swap in a '72 4x4 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

220mph · 06-09-2006, 02:42 AM

Hi, I am new to this forum and yet I can see that there is a lot of experience among the members.
Has anyone replaced a 4-speed Muncie with a Tremmic 5-speed w/overdrive, or with any other 5-speed? Any help is greatly appreciated!!!

NitroMike · 06-09-2006, 06:57 AM

I'm in the midst of replacing the column shifted three-speed in my '67 with a new Tremec five-speed. I'll let you know how it goes as I finish it up.

**special-K** · 06-09-2006, 06:58 AM

Not the Tremmac.But,the NV4500 is a common swap.You need either the later NP205 with the round mating surface(front)or a right-hand drop-out NP241 like what was in the last of the Blazers/Jimmys/Suburbans with solid front axles(pre-92).I believe t-case adaptors are made for other cases,but I wouldn`t bother with any other than the two I mentioned.

220mph · 06-09-2006, 04:12 PM

I spoke with the guys @ NV4500. This seems like a well thoughtout quality product.

Has anyone tried the NV4500 and are you happy with the results?

Thanks for taking the time to answer

boundstaffpress · 06-09-2006, 05:58 PM

One thing I know about that trans is that you can't haul a trailer in 5th gear. It will wear out in 500 mi. Owners manuals for any vehicle with a nv4500 will say it voids the warranty.

220mph · 06-09-2006, 08:10 PM

Quote:

Originally Posted by boundstaffpress

One thing I know about that trans is that you can't haul a trailer in 5th gear. It will wear out in 500 mi. Owners manuals for any vehicle with a nv4500 will say it voids the warranty.

Which 5-speed will handle towing?

**special-K** · 06-10-2006, 08:58 AM

You shouldn`t tow in O/D with any light truck.

1969 GMC · 06-10-2006, 06:59 PM

I am going to swap in a NP542GL transmission from a C60. It has 5 speeds, but 5th is direct. It is pretty much a bolt-in.

Chevrolet4x4s · 06-10-2006, 07:31 PM

What about a 6 speed out of a latemodel F body into a 2wd?
Shane

44th Miss Inf · 06-24-2006, 07:32 AM

I swapped in a nv4500 in place of a sm465 4 spd in my 4x4. The 81 up 208c case is a direct bolt on.

1969 GMC, doesn't that trans have the bigger input shaft? Or was that just the earlier 2T 5 spds?

Virgil

1969 GMC · 06-25-2006, 06:37 PM

Quote:

Originally Posted by 44th Miss Inf

1969 GMC, doesn't that trans have the bigger input shaft? Or was that just the earlier 2T 5 spds?

Virgil

Mine has the BIG input shaft, well bigger than my SM465's anyway. But I got the tranny complete with clutch, pressure plate, flywheel, bellhousing, and part of the clutch linkage, so it bolts up to the crank just like the stock stuff did. It was originally behind a 427 tall deck which has neutral balance just like the SBC, so i am good as far as that goes. I am going to use a divorced NP201 from an old International behind this beast, which is huge itself. Not too worried about breakage

EDIT: see my sig? thats the new shift pattern...will take a little getting used to.

**Daubs** · 07-12-2006, 10:07 AM

Quote:

Originally Posted by special-K

You shouldn`t tow in O/D with any light truck.

Hmmmm...my 04 8.1/Allison does just fine towing in O/D.

TP from Cntl PA · 07-16-2006, 04:30 PM

Quote:

Originally Posted by Daubs

Hmmmm...my 04 8.1/Allison does just fine towing in O/D.

Maybe with a snowmobile trailer................Try it with a Gooseneck full of steers.

Main problem with the NV, is unlike an Auto which knows when to downshift, the guy in the seat doesn't think that way and problems start. Most of the NV problems started because of an engine called a 5.9 Cummins. You have so much torque it is possible to pull hills in OD which a huge load, the engine has so much low end it wouldn't quit, and common sense tells you that a rinky dink pickup tranny in OD behind that engine which has a much larger transmission behind it in Commercial applications is gonna be the thing that will break.

Anyway, I don't think an NV would mind running in OD towing down the fairly flat 4 lane black top...........Its the instances I mentioned above where they flake out.

**special-K** · 07-17-2006, 07:45 AM

I`ve gotten around 100,000 miles from NV4500s in two different`K3500s w/6.5TD.I ignored the "no tow in o/d" warning.The NV4500 is hardly a rinky dink trans for a light truck.They can take torque in the 500+ range w/no problems.Anything more than that,you`re on your own with any light truck tranny.

06-09-2006, 02:42 AM	#1
220mph Speed Limits...yeh right Join Date: Jun 2006 Location: So Cal Posts: 72	5-SPEED transmission swap in a '72 4x4 Hi, I am new to this forum and yet I can see that there is a lot of experience among the members. Has anyone replaced a 4-speed Muncie with a Tremmic 5-speed w/overdrive, or with any other 5-speed? Any help is greatly appreciated!!!

06-09-2006, 06:57 AM	#2
NitroMike Active Member Join Date: Dec 2005 Location: Bethlehem, PA Posts: 346	Re: 5-SPEED transmission swap in a '72 4x4 I'm in the midst of replacing the column shifted three-speed in my '67 with a new Tremec five-speed. I'll let you know how it goes as I finish it up. __________________ The older I get, the faster I was!!

06-09-2006, 06:58 AM	#3
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: 5-SPEED transmission swap in a '72 4x4 Not the Tremmac.But,the NV4500 is a common swap.You need either the later NP205 with the round mating surface(front)or a right-hand drop-out NP241 like what was in the last of the Blazers/Jimmys/Suburbans with solid front axles(pre-92).I believe t-case adaptors are made for other cases,but I wouldn`t bother with any other than the two I mentioned. __________________ "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 ~

06-09-2006, 04:12 PM	#4
220mph Speed Limits...yeh right Join Date: Jun 2006 Location: So Cal Posts: 72	Re: 5-SPEED transmission swap in a '72 4x4 I spoke with the guys @ NV4500. This seems like a well thoughtout quality product. Has anyone tried the NV4500 and are you happy with the results? Thanks for taking the time to answer

06-09-2006, 05:58 PM	#5
boundstaffpress Jamie Hyneman is my twin Join Date: Nov 2005 Location: La Junta, Colorado Posts: 705	Re: 5-SPEED transmission swap in a '72 4x4 One thing I know about that trans is that you can't haul a trailer in 5th gear. It will wear out in 500 mi. Owners manuals for any vehicle with a nv4500 will say it voids the warranty. __________________ Justin SOLD 1967 K10 Fleetside, 283, Front and Rear Posi SOLD Color Wiring Diagrams Now in High Resolution V8 and Cab and Cab and Chassis

06-10-2006, 08:58 AM	#7
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: 5-SPEED transmission swap in a '72 4x4 You shouldn`t tow in O/D with any light truck. __________________ "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 ~

06-10-2006, 06:59 PM	#8
1969 GMC Registered User Join Date: Feb 2003 Location: The Rubber City Posts: 5,498	Re: 5-SPEED transmission swap in a '72 4x4 I am going to swap in a NP542GL transmission from a C60. It has 5 speeds, but 5th is direct. It is pretty much a bolt-in. __________________ 1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650

06-10-2006, 07:31 PM	#9
Chevrolet4x4s Registered User Join Date: Nov 2005 Location: WV Posts: 227	Re: 5-SPEED transmission swap in a '72 4x4 What about a 6 speed out of a latemodel F body into a 2wd? Shane __________________ 1993 K1500 350 5 speed 1985 K10 Silverado Vortec 406 5 speed (in body shop) "I been drivin' this '85 pickup truck Them buddies of mine call it a bucket of rust She's a little beat up but she still runs like the wind Yeah, kinda like me I been banged and bruisedBeen around the block a time or two But I'm runnin' like new goin' places I never been No, I ain't broke I'm just broken in" 1963 Dodge Townwagon(its amazng what 30 years and zero miles will do to a vehicle ) Member#20327

06-24-2006, 07:32 AM	#10
44th Miss Inf Registered User Join Date: Sep 2002 Location: Liberty, Mississippi Posts: 672	Re: 5-SPEED transmission swap in a '72 4x4 I swapped in a nv4500 in place of a sm465 4 spd in my 4x4. The 81 up 208c case is a direct bolt on. 1969 GMC, doesn't that trans have the bigger input shaft? Or was that just the earlier 2T 5 spds? Virgil

07-17-2006, 07:45 AM	#14
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: 5-SPEED transmission swap in a '72 4x4 I`ve gotten around 100,000 miles from NV4500s in two different`K3500s w/6.5TD.I ignored the "no tow in o/d" warning.The NV4500 is hardly a rinky dink trans for a light truck.They can take torque in the 500+ range w/no problems.Anything more than that,you`re on your own with any light truck tranny. __________________ "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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