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Old 03-29-2008, 08:40 PM
jefro2729 jefro2729 is offline
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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
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Old 03-29-2008, 10:55 PM
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Re: tranny swap help asap

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.
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Old 03-29-2008, 11:58 PM
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Re: tranny swap help asap

will it cause to much stress on the weaker engine?
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Old 03-30-2008, 12:20 AM
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Re: tranny swap help asap

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.
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Old 03-30-2008, 12:27 AM
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Re: tranny swap help asap

its got 213k on it lol so what does that mean?
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Old 03-30-2008, 12:55 AM
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Re: tranny swap help asap

That if you push it real hard you will begin to burn oil.
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Old 04-01-2008, 12:49 AM
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Re: tranny swap help asap

lol be easy on the old girl..
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Old 04-17-2008, 03:35 PM
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Re: tranny swap help asap

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.
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