4 spd tranny to 5 spd tranny

which numbers on the tag are what. iknow the first one is the paint code. 138 then its like tr/a/tm....i dont know what those are. but what i think is the rear end code is G662 which isnt referenced on the decifer i have. i think the last number is w46 which i think is the tranny type. which isnt listed either. my 88 must be one hell of an odd truck.

You probably have this sorted by now, but if not. G662 is an 2 pinion 8" ring gear with a 3.08:1 ratio. This is the same set up I have in my truck with the W48 4 speed.

How did you like the 5 speed in your truck? How did the mount work out? Somebody told me that the 5 speed was a little longer than the 4 speed and the driveshaft would need to be shortened. Did you have to shorten yours?

Thanks.

no, everything was a straight over swap. i did have to use the tranny mount for the 5 speed though. everything else also just swapped right in...the drive line was fine, crossmember was fine, clutch, clutch fork, and slave cylinder all mated together nicely. the trannys are the same length. just the 5 speed has an extra little hump at the bottom...

i have since swapped my 4 speed tranny back in the truck because i didnt gain anything out of the 5 speed with my stock 4 speed rear end. the 5 speed caused my truck to lose its lowerend, and at top end it actually tached higher at 80 than it did whith the 4 speed. had i swapped the 5 speed rear end gearing im sure it would have been perfect but i didnt.

i have a 5 speed tranny and a brand new tranny mount for sale if anyone is interested. ive opened the tranny up myself, the sincros, gears, and linkage are all in great shape.