Turbo 6.2 or 292 swap - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**hatzie** · 08-01-2022, 04:14 PM

Quote:

Originally Posted by evoLnivleK

Well, the saga continues...

Ditching the th400. Picked up an nv4500 today. Along with column, pedals, and a few other needed bits. Just couldn't justify rebuilding the 400 with the amount of towing I do.

Turbo is on. Manual swap next weekend. This will truly be a different truck when it is back on the road.

Avoid towing in 5th gear. The 4500 has problems with 5th gear breaking the snap ring groove and sliding off the end of the shaft when you put a lot of torque through that gearset

evoLnivleK · 08-01-2022, 06:10 PM

Yeah towing in O/D seems like a bad idea. I was mainly after the granny low. Makes backing up and maneuvering a trailer in the city and the dump much easier. I'm one of the few people that likes short wheelbase towing. I work mainly on Ohio State campus, so I use my FJ cruiser and m1101 a lot to get in and out of tight alleys and drives.

Clutch and flywheel ordered. This should be a fairly straightforward swap. Even the driveshafts fit without modification. H2 wheels and tires last on the list.

**hatzie** · 08-01-2022, 09:44 PM

The Granny 6.55:1 on the SM465 is lower than all of the NV4500 offerings
The 1993 NV4500 was only slightly higher geared at 6.35:1 but the 1994 & later was 5.61:1

When you aren't towing 0.73:1 Overdrive 5th gear is nice vs the 1:1 4th gear on the SM465.
You could get the same 0.73:1 OD with a Gear Vendors OD box on the SM465 and split shift 1st, 2nd, & 4th gears to even out the RPMs and you can tow in Overdrive. L, LOD, 1, 1OD, 2, 3, 3OD

If I had the 76 to do over I would've put a GV unit and an SM465 in it. Lots less hassle to install with 7 or 8 forward towing gears depending on whether you want to split 2nd gear or not

evoLnivleK · 08-01-2022, 09:52 PM

I have a 93 nv4500. I think it is the best trans for my needs. Not sure how heaving this reading utility bed is, but would really like to go back to a stock bed eventually.

evoLnivleK · 08-18-2022, 08:36 PM

Well drove it today for the first time since the swap. Feels pretty good. Really like the nv4500. Swap couldn't have been easier. I remembered I had my bosses old squarebody for parts a few counties over, so I robbed the 5 speed pedal set, steering column, and a few other small items. Very happy with how this is turning out. 5 psi of boost for now

**hatzie** · 08-19-2022, 05:09 PM

I'd take it easy on the boost. Use it to make sure there's enough air to burn the fuel present and maybe turn the fuel up a small amount then leave it at that.
Black smoke is wasted power. I like my exhaust nice and clean.

The AMG Detroit 6.x bottom end isn't that tough. Main web cracks happen when you overdo it and even when you just drive em.

evoLnivleK · 08-19-2022, 06:44 PM

Most likely staying at 5 psi or less even. Egts 6-800. The truck already feels 100x better with the 5 spd. My goals have more than been met.

I did turn the pump just a bit. Not knowing the history, I didn't want to futz with it too much.

Exhaust nice and clean under load and idle/startup. 3" 6.5 downpipe modified to fit. 3" the rest of the way out. Pretty quiet...relatively speaking

08-01-2022, 06:10 PM	#27
evoLnivleK Registered User Join Date: Oct 2018 Location: COLUMBUS Posts: 37	Re: Turbo 6.2 or 292 swap Yeah towing in O/D seems like a bad idea. I was mainly after the granny low. Makes backing up and maneuvering a trailer in the city and the dump much easier. I'm one of the few people that likes short wheelbase towing. I work mainly on Ohio State campus, so I use my FJ cruiser and m1101 a lot to get in and out of tight alleys and drives. Clutch and flywheel ordered. This should be a fairly straightforward swap. Even the driveshafts fit without modification. H2 wheels and tires last on the list.

08-01-2022, 09:44 PM	#28
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: Turbo 6.2 or 292 swap The Granny 6.55:1 on the SM465 is lower than all of the NV4500 offerings The 1993 NV4500 was only slightly higher geared at 6.35:1 but the 1994 & later was 5.61:1 When you aren't towing 0.73:1 Overdrive 5th gear is nice vs the 1:1 4th gear on the SM465. You could get the same 0.73:1 OD with a Gear Vendors OD box on the SM465 and split shift 1st, 2nd, & 4th gears to even out the RPMs and you can tow in Overdrive. L, LOD, 1, 1OD, 2, 3, 3OD If I had the 76 to do over I would've put a GV unit and an SM465 in it. Lots less hassle to install with 7 or 8 forward towing gears depending on whether you want to split 2nd gear or not __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful. Last edited by hatzie; 08-01-2022 at 09:59 PM.

08-01-2022, 09:52 PM	#29
evoLnivleK Registered User Join Date: Oct 2018 Location: COLUMBUS Posts: 37	Re: Turbo 6.2 or 292 swap I have a 93 nv4500. I think it is the best trans for my needs. Not sure how heaving this reading utility bed is, but would really like to go back to a stock bed eventually.

08-18-2022, 08:36 PM	#30
evoLnivleK Registered User Join Date: Oct 2018 Location: COLUMBUS Posts: 37	Re: Turbo 6.2 or 292 swap Well drove it today for the first time since the swap. Feels pretty good. Really like the nv4500. Swap couldn't have been easier. I remembered I had my bosses old squarebody for parts a few counties over, so I robbed the 5 speed pedal set, steering column, and a few other small items. Very happy with how this is turning out. 5 psi of boost for now

08-19-2022, 05:09 PM	#31
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: Turbo 6.2 or 292 swap I'd take it easy on the boost. Use it to make sure there's enough air to burn the fuel present and maybe turn the fuel up a small amount then leave it at that. Black smoke is wasted power. I like my exhaust nice and clean. The AMG Detroit 6.x bottom end isn't that tough. Main web cracks happen when you overdo it and even when you just drive em. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.

08-19-2022, 06:44 PM	#32
evoLnivleK Registered User Join Date: Oct 2018 Location: COLUMBUS Posts: 37	Re: Turbo 6.2 or 292 swap Most likely staying at 5 psi or less even. Egts 6-800. The truck already feels 100x better with the 5 spd. My goals have more than been met. I did turn the pump just a bit. Not knowing the history, I didn't want to futz with it too much. Exhaust nice and clean under load and idle/startup. 3" 6.5 downpipe modified to fit. 3" the rest of the way out. Pretty quiet...relatively speaking



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.