quote:

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Originally posted by Johnny408:
I need help deciding which gears will work best for me on my new project that i just picked up. The car is an auto 90 Gt. The car is all stock right now but will soon see some mods but want to do the rear end and gears first. I also drive the car from san jose to modesto during the week.

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quote:

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Originally posted by 95gtdrop:
It's an auto not a manual. Therefore you'll be revin out 4th with 410s. My friend had an auto with 373s. It was perfect. Still held a decent rpm and speed on the freeway. 390s would be the max I'd gear a daily driven auto.

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missd that your right^^
 

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Posted by Johnny408 (Member # 9147) on :
 
Ok thanks for the input. 3.73's is what i'm going to go with. If i'm not satisfied then guess i'll be stepping it up to the 3.90's.
 

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Posted by sydewayzLX50 (Member # 10217) on :
 
Just go with the 4.10s youll be glad you did. I wouldve gone with them in my car but i would have a really short first gear (5spd). Autos are perfect for 4.10s
 

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Posted by Blk93Pony (Member # 10798) on :
 
I went from stock to 4.10s in my auto fox gt and loved it but then started drivin about 20 miles to my job so it was killin my gas mileage and plus the revved up engine was getting annoying so switche to 3.73s and I shoulda got these to begin with
 

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Posted by CLEEN 50 (Member # 5867) on :
 
If im not mistaken gears do not affect gas mileage, and if youre auto go 4.10s and dont look back. Autos need the extra bang trust me. You'll be fine on the freeway

Auto N/A
4.10
Auto S/C
3.73

T-5 N/A
3.73
T-5 S/C
3.55


..is the norm I would say.

[ August 05, 2011, 12:09 AM: Message edited by: CLEEN 50 ]
 

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Posted by 4NIK8TR (Member # 11147) on :
 
4.10s and a reverse manuel valvebody is solid
 

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Posted by triple b (Member # 8763) on :
 
3.55 all bolt ons with 26" tire get you to the end of the track in 3rd about to redline
 

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Posted by 98z28 (Member # 8408) on :
 
410s you will love it!
 

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Posted by 95gtdrop (Member # 7478) on :
 

quote:

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Originally posted by CLEEN 50:
If im not mistaken gears do not affect gas mileage, and if youre auto go 4.10s and dont look back. Autos need the extra bang trust me. You'll be fine on the freeway

Auto N/A
4.10
Auto S/C
3.73

T-5 N/A
3.73
T-5 S/C
3.55


..is the norm I would say.

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quote:

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Originally posted by 95gtdrop:

quote:

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Originally posted by CLEEN 50:
If im not mistaken gears do not affect gas mileage, and if youre auto go 4.10s and dont look back. Autos need the extra bang trust me. You'll be fine on the freeway

Auto N/A
4.10
Auto S/C
3.73

T-5 N/A
3.73
T-5 S/C
3.55


..is the norm I would say.

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they dont affect gas mileage? Tell me that having 410s over stock gearing wont affect your mpg on the freeway going 65-70. so your sayingyou get the same mpg at 2300 rpm and 2800 rpm for ( using those rpms as an example.) id take that bet with you

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quote:

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Originally posted by 95gtdrop:

quote:

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Originally posted by CLEEN 50:
If im not mistaken gears do not affect gas mileage, and if youre auto go 4.10s and dont look back. Autos need the extra bang trust me. You'll be fine on the freeway

Auto N/A
4.10
Auto S/C
3.73

T-5 N/A
3.73
T-5 S/C
3.55


..is the norm I would say.

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they dont affect gas mileage? Tell me that having 410s over stock gearing wont affect your mpg on the freeway going 65-70. so your sayingyou get the same mpg at 2300 rpm and 2800 rpm for ( using those rpms as an example.) id take that bet with you

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Im just paraphrasing what I heard and read over the last several years from well known tech heads in this forum ;-)
I believe Blind and JohnB would agree. It all depends how you drive. Folks who get gears are more inclined to drive harder and faster. If you treat it just like you did before you shouldn't notice a difference, at least this is what was explained to me. take it or leave it..makes no difference to me.

[ August 05, 2011, 04:18 PM: Message edited by: CLEEN 50 ]
 

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Posted by CobraCoupe (Member # 7233) on :
 
More RPM = more fuel consumption = less gas mileage
 

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Posted by 95gtdrop (Member # 7478) on :
 
thank you!! ^

if your not driving on the freeway at all, you may keep the same mpgs in the city. otherwise say bye bye to your gas milage and hello to gas consumption
 

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Posted by JohnB (Member # 969) on :
 
Stock vs 4.10s, yes...you'd see little, if any MPG difference. 3.73's vs 4.10's, you won't. And I'll take that bet any day.


I've said it plenty of times...the only thing that effects fuel economy is the right foot.
 

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