MY FWD WONT WORK BUT RWD DOES

[ilovemytota]

i was driving my toyota tercel sr5 4wd today its a 1985 with 100,000 miles ran great but then the fwd just started sticking then pop no front wheel drive lots of clunking when i drive i keep it in 4wd cause rear wheels still work but not fwd rpms climb when i put it back into fwd and clunking

[takza]

Front ring and pinion went to heaven?

[ilovemytota]

i dont know if its that .....but that may just be it.... what size front ring and pinion came in those 1985 tercel 4wd sr5 "manual" trans

[Highlander]

This is a silly question, I know, but have you looked at your front axles? if a CV joint gave it up, no power will go to the undamaged side and you'll get no motion. Did you have any clunking going around corners before it stopped moving? I'd look at easier solutions before jumping into a new/used diff.
BTW the ratios are 4.11:1 from '85 on.

[Petros]

pull the front cover off, it is easy to get to, and inspect it. Could be ring and pinion, could be input shaft, could be failed spider gears. You definitely have major problem, so the trans has to come out one way or another. If the problem is contained in the diff only, you can swap out the whole assembly with the 4.1:1 ratio, that way you do not have to set the lash. If it is the input shaft failure, than you probably should start looking for a whole trans assembly since you can not buy hard parts any longer.