View Full Version : NV4500 in a FJ40?

07-30-2009, 09:41 AM
A little history: I bought a chevy big block and tranny combo about 8 years ago. I wanted the engine and my Dad wanted the tranny. I installed the 427 in my camaro and the tranny has been sitting in my Dad's barn in Kansas.
My Dad has no idea what tranny is except that it's a 5-speed. He found a number on the main case and my google search resulted in a 1992-1995 GM NV4500. The engine/tranny combo came out of a cargo van so I'm pretty sure its a 2wd NV4500.

So recently I picked up a 66 FJ40 with a 350 mated to the stock 3-speed/t-case. I'm thinking a 5 speed would be a sweet upgrade. Anyone have experience or can point me in the right direction with installing a NV4500 in a FJ40 with a V8?

Thanks! Doug

Uncle Ben
07-30-2009, 10:21 AM
I personally do not care for the 4500 in a trail rig. Most people jump at the idea of a 6-1 crawler gear along with a -.6 overdrive but the gear splits of the normal road gears are far from ideal!

GM 93-94 95/up GM; 93/up Dodge
First Gear 6.34 5.61
Second Gear 3.44 3.04
Third Gear 1.71 1.67
Fourth Gear 1.00 1.00
Fifth Gear 0.73 0.73
Reverse 6.34 5.61

A great 5 speed conversion is the Toy H55F! While it doesn't have a "granny low" first gear it does have very good gear splits and a respectable first gear!


07-30-2009, 02:08 PM
Advance Adaptors has excellent books on this swap and tranny. Also, you may need a different output shaft or a 4WD tranny to make this work. I'm not sure 2WD NV4500s lend themselves to a 'cruiser/4WD swap. After you see the AA stuff, you'll know all there is to know. Not all their info is free, but don't be afraid to spend $10 on one of their technical books - they're great.

07-30-2009, 03:51 PM
Steve, you were right, the Advanced Adapters tech rep was great to talk to about my swap. I'm going to not move forward with using the NV4500 because of the cost to remove and replace the output shaft and housing. A.D. does offer a kit for my application that runs about $1200. If I had the 4wd version of the NV4500, I would give this serious consideration.


07-30-2009, 05:28 PM
Another issue with the NV4500 is the extra length this adds to your overall drive train length. You would really need to extend your wheel base and of course modify your drive lines.

07-30-2009, 05:49 PM
People bash AA for high prices, but their resource books are incredible and their phone-support guys can clear up 5 years of your misconceptions in about 5 minutes. I was afraid they'd tell you what they told you - but I see 4WD NV4500 trannys show up every now and then at reasonable prices. Beware of a used one that needs a rebuild, as they are not indestructable, especially behind a Cummins diesel. Perhaps the Toyota tranny is a better swap afterall, since I think you need floorpan mods for an NV4500, as it's physically quite large - and the driveline length issue looms.

08-01-2009, 11:29 AM
I had an NV4500 in my 87' FJ60. My biggest complaint was the gearing. Third and fourth are way too far apart. Even with a small block, I'd lose too much torque and would have to leave it in third.