any one can help me please I have 1990 Chevrolet Blazer and I want to install 33/12.50r15 tire . do I have to changing the transmission ? the transmission is 750 and the ENGINE is 350ci V8

 

You've already asked this question here. Try not to post the same thing more than once. It's against the rules.

 

I'm sorry

but can you help me about the problem

 

im guessing you have a full-size? you'll be fine w/ 33's. on my old 3/4 ton i ran 35's with the stock 700r4. i did change the ring and pinions to 4.10:1 to get a little lower gearing. i had no problems with the tranny, though, and i beat the crap out of that truck.

 

thanks for your reply.

but the problem is that I have change the transmission 2 time . I don’t no what to do

 

Heat is the number one killer of trannies. Upgrading ring and pinion gears will keep the tranny and engine in the proper power band and reduce the amount of heat generated, plus pick up some lost performance. However to make the tranny survive, I would recommend an auxiliary tranny cooler. The tranny will generate tons of heat while 4wheeling. Proper ring and pinions will only reduce that a little, the auxilary tranny cooler will help the most.