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Discussion Starter · #1 ·
im pritty sure it is but is the Turbo tranny geared higher than a NA tranny? im sure their different but just to make sure.
thanks
harry
 

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...Yes
 

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n/a tranny (W58) 1st: 3.29 2nd: 1.89 3rd: 1.28 4th: 1.00 5th: 0.78 REV: 3.77

turbo tranny (R154) 1st: 3.30 2nd: 1.95 3rd: 1.34 4th: 1.00 5th: 0.75 REV: no idea


all the info you need :)
 

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Discussion Starter · #5 ·
ok. because i curently have a NA tranny with a turbo engine. and at about 60mph im doing about 3000rpsm's which is killing me for fule milage.
my buddy has turbo engine turbo tranny and hes around 2300 rpm at 60mph. so i was just wondering if this will change my RPM to Speed ratio. i also have the Turbo diff out of an automatic. im not sure which one tho.
thanks for your imput.
harry
 

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Discussion Starter · #6 ·
ok i went to school today and i talked to my teacher and he said that the trannys have next to no difference for gear ratio. but i have a diff out of a Turbo AUTO.... soo to get a higher gear ratio i should get a % speed turbo diff... correct?
 

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Your teacher don't know shit :D
 

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Discussion Starter · #9 ·
ha well i donno hes a collage teacher. but it makes sence doesnt it? or are they the same? does some one have a sight for the diffs?
 

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The Gearing is different and Drive Shafts :scratch:
NA:
87-92 4.30
Turbo:
87-88 3.91
89-92 3.73
Don't know if automatics had different ratio's? :ugh2:

:)
 

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Discussion Starter · #13 ·
ok great. thas what i need to know. and soon as how my engine and diff were out of a 87 then its a 3.9..... so i do wana go for that tranny.
 

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CRE said:
3000RPM @ 60MPH? Is that right for a 3.9? I could swear I'm running lower RPMs than that at 60.
that sounds more like 4.30's

i swaped to 3.93's and im crusing about 75-80 around 3k
 

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pimptrizkit said:
that sounds more like 4.30's

i swaped to 3.93's and im crusing about 75-80 around 3k
Exactly what I was thinking. At 60 I'm right around 2500RPM..... I am running a w58, but the 5th gear difference is not THAT big.


EDIT: oh, and I'd guess you're buddy's running a 3.71 (or was it 3.73?) to be at 2300 at 60MPH.
 

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Discussion Starter · #18 ·
Quote:
Originally Posted by harry89supra
but from an auto - 5 speed the differentials are the same?



Yes.
ok thanks

so if im running such high rpms would it be because of the tranny or diff. it doesnt look like the tranny gears are very different. i will check which diff i have today.

3000RPM @ 60MPH? Is that right for a 3.9? I could swear I'm running lower RPMs than that at 60.
yes thats what im running and its brutal.
the only reason it would be a 4.3 is if some one changed the rear diff.
thanks for the help guys
harry
 
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