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406 Q-ship · 10-07-2011, 02:46 PM

If your unhappy with the engine RPM when the powerglide in high gear, then any of the 3 speeds will be the same. High gear in a PG, Th350, and Th400 are all 1 to 1. The 700R4 can work fine in the average 1/2 ton truck duty, if you race or haul alot of extra heavy loads in the truck a 700R4 may not be the best. Here is another choice, change the rear axle ratio to a more highway friendly one, 3.42 and put a gear vendors OD on a TH350 or TH400.

Another OD trans to investigate is the 200 4R, never came in trucks but full size GM, Buick Grand Nationals, Monte Carlo and the SS, and the pedestrian G-bodies (regal, cutlass, grand prix). It is an easier install than even the 700 R4 because the length of the trans is almost the same as a short shaft TH400. and trans mount is in the same location as a PG/TH350.

10-07-2011, 02:46 PM	#9
406 Q-ship Registered User Join Date: Oct 2010 Location: Largo Florida Posts: 632	Re: What transmission to change to??? If your unhappy with the engine RPM when the powerglide in high gear, then any of the 3 speeds will be the same. High gear in a PG, Th350, and Th400 are all 1 to 1. The 700R4 can work fine in the average 1/2 ton truck duty, if you race or haul alot of extra heavy loads in the truck a 700R4 may not be the best. Here is another choice, change the rear axle ratio to a more highway friendly one, 3.42 and put a gear vendors OD on a TH350 or TH400. Another OD trans to investigate is the 200 4R, never came in trucks but full size GM, Buick Grand Nationals, Monte Carlo and the SS, and the pedestrian G-bodies (regal, cutlass, grand prix). It is an easier install than even the 700 R4 because the length of the trans is almost the same as a short shaft TH400. and trans mount is in the same location as a PG/TH350. __________________ Lifes journey is not to arrive at the gate well preserved, it is to slide in sideways all used up and wore out yelling.....God what'a ride! Where patience fails, force prevails Stapp's Ironical Paradox "The universal aptitude for ineptitude makes any human accomplishment an incredible miracle." Last edited by 406 Q-ship; 10-07-2011 at 02:51 PM.