tranny swap help asap

i just put a 88 si tranny onto a 91 hf engine.everything seems to be working ok but the rpms are running a good bit higher,is this ok or do i have a problem?please help leaving the state tomorrow and if i need to swap it back i will.thanks guys

The Si trannies have a shorter gear than the HF and the lower other lower models. This results in a little higher RPM, nothing to worry about.

will it cause to much stress on the weaker engine?

Engine isnt necessarily weaker (not in stock form anyway). But the way it was built and the cam it has in it wont let it make a whole lot of power up top anyway. It was made for high mpg cruising, but no it wont hurt it..unless its got like 250k mi on it lol.

its got 213k on it lol so what does that mean?

That if you push it real hard you will begin to burn oil.

lol be easy on the old girl..

Not to worry thats a good upgrade from Dx to Si. Definitely shorter gears which gets you out of the hole faster and well worth it. :bigthumb: