5-speed options - The 1947 - Present Chevrolet & GMC Truck Message Board Network

krue · 07-25-2005, 03:18 AM

What would be my options for a 5 speed to go in my 4x 72 blazer behind the 250?

**special-K** · 07-25-2005, 07:01 AM

NV4500 is one I know.The Gutrags,I here,are something to stay away from.I don`t hear about using the NV3500 in swaps,either.

Americanrider · 07-25-2005, 10:24 PM

Getrags are ok, as long as you don't try to tow with them. Easy to find, had one in my 91 Sliverado 4x4 and it also had a Hyd clutch.

krue · 07-25-2005, 11:19 PM

Ok, I don't know crap about these trannies, what applications (junkyard) do I need to look for these trannies in?

**special-K** · 07-26-2005, 07:31 AM

Post-88 GM trucks.Is it for a 4wd or 2wd?Stay with same/same on donor.

BUDDY · 08-02-2005, 06:01 PM

Nowadays there area couple of options to do 5-speed conversion. The toughest & probably most popular is the NV4500 from a 1992+ chevy or GMC pick-up. You can usually find these behind diesels or bigblocks & the 92-96 versions have a 6.34:1 low range most of the time. (the rest of the time they have a 5.6?:1 low range) These are some heavy duty transmissions but they are somewhat expensive - $1000-$2500 for the swap. They have a PTO output on both sides of the cast iron case and an O/D 5th gear.

A great transmission/transfercase combo is the NV4500 with a doubler adapter for a NP203 low-range box then mated to the NP205 for awesome low-range capabilities & a highway friendly O/D of .7:1.

Couple of issues regarding the swap that I know about. First of all, they only came with a hyd clutch. "So what, I wanna upgrade to a hyd clutch anyway." The problem is that the slave cylinder for the clutch is on the passenger side about exactly where the driveshaft would go. Not as much of a problem in 2WD, but my truck is 4WD, so it's a problem for me.

The fix is to get the entire trans/case combo from one of these trucks & put it in. Which presents another problem, driver's side pumpkin, so now you need a driver's drop front axle.

It's just a couple thou more c'mon!!

another option is to get an adapter kit from advance adapters, (this is the whole adapter kit for a 27 spline (mated to a th350 trans) np205) I think. Again a little pricey, but it's just money.

I've also heard that you can get a 2WD NV4500 & use all factory parts. See here

Beyond that, there was the Clark 5-speed that was used on our trucks from the factory, (at least the 1-tons). Or you could go with an Allison from behind a Duramax or BBC from a late model.

FWIW,

07-25-2005, 03:18 AM	#1
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,448	5-speed options What would be my options for a 5 speed to go in my 4x 72 blazer behind the 250? __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

07-25-2005, 07:01 AM	#2
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	NV4500 is one I know.The Gutrags,I here,are something to stay away from.I don`t hear about using the NV3500 in swaps,either. __________________ "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 ~

07-25-2005, 11:19 PM	#4
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,448	Ok, I don't know crap about these trannies, what applications (junkyard) do I need to look for these trannies in? __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

07-26-2005, 07:31 AM	#5
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Post-88 GM trucks.Is it for a 4wd or 2wd?Stay with same/same on donor. __________________ "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 ~

08-02-2005, 06:01 PM	#6
BUDDY Global warming is a myth Join Date: Apr 2003 Location: Henderson, NV Posts: 208	Nowadays there area couple of options to do 5-speed conversion. The toughest & probably most popular is the NV4500 from a 1992+ chevy or GMC pick-up. You can usually find these behind diesels or bigblocks & the 92-96 versions have a 6.34:1 low range most of the time. (the rest of the time they have a 5.6?:1 low range) These are some heavy duty transmissions but they are somewhat expensive - $1000-$2500 for the swap. They have a PTO output on both sides of the cast iron case and an O/D 5th gear. A great transmission/transfercase combo is the NV4500 with a doubler adapter for a NP203 low-range box then mated to the NP205 for awesome low-range capabilities & a highway friendly O/D of .7:1. Couple of issues regarding the swap that I know about. First of all, they only came with a hyd clutch. "So what, I wanna upgrade to a hyd clutch anyway." The problem is that the slave cylinder for the clutch is on the passenger side about exactly where the driveshaft would go. Not as much of a problem in 2WD, but my truck is 4WD, so it's a problem for me. The fix is to get the entire trans/case combo from one of these trucks & put it in. Which presents another problem, driver's side pumpkin, so now you need a driver's drop front axle. It's just a couple thou more c'mon!! another option is to get an adapter kit from advance adapters, (this is the whole adapter kit for a 27 spline (mated to a th350 trans) np205) I think. Again a little pricey, but it's just money. I've also heard that you can get a 2WD NV4500 & use all factory parts. See here Beyond that, there was the Clark 5-speed that was used on our trucks from the factory, (at least the 1-tons). Or you could go with an Allison from behind a Duramax or BBC from a late model. FWIW, __________________ Henderson, NV 1972 K5 - Lifelong project - Needs Time, Place, Help & Parts!! 1990 K5 with 37's 2003 Discovery SE7 - Wife's

07-25-2005, 10:24 PM	#3
Americanrider Registered User Join Date: Dec 2004 Location: NW, WA. Posts: 1,421	Getrags are ok, as long as you don't try to tow with them. Easy to find, had one in my 91 Sliverado 4x4 and it also had a Hyd clutch.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.