01 Gt 4.10 gear what rpm

trickyshadow

New Member
May 17, 2005
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Hi guys i have a 01 GT 4.10 gear, just wondering at 70 miles per hr what rpm are you running. At 70 i am just above 3000 and at 50 i am at 1900 both of these speeds are in 5th gear with a 3650 trans and my mileage now sucks :shrug:
 
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trickyshadow said:
At 70 i am just above 3000 and at 50 i am at 1900 both of these speeds are in 5th gear with a 3650 trans and my mileage now sucks :shrug:

That seems about right if I can recall correctly. I hardly go on the freeway to much around here but im pretty sure thats what im about at.
 
both the t-45 and the 3650 have a 5th gear ratio of .67.

with that being said, i have a 00 GT with the t-45 and when i am at 3000 rpms in 5th i am cruising right at 80mph.

you either have a lower gear then 4.10's, or your speedometer is off.
 
pgreenlaw said:
both the t-45 and the 3650 have a 5th gear ratio of .67.

with that being said, i have a 00 GT with the t-45 and when i am at 3000 rpms in 5th i am cruising right at 80mph.

you either have a lower gear then 4.10's, or your speedometer is off.

In a sense you are correct, but looking at Tremec's website, there are different 5th gear ratios for the 3650. My old 2000 GT with the T-45 was pulling 2000 rpm at 70 mph with the stock 3.27s. My 2002 GT pulls 2000 rpms at ~74-75 mph with the stock rear. That would make me think that my 5th gear is not the .67 but rather the .62.
I used to have a link to the website to calculate all this but not anymore. Maybe its in the sticky.
 
Thanks guys I went back to my tuner and we looked at my chip and the chip had the problem, he flashed it and tweeked it a bit and now it's dead on, at 70 i am running now about 2600 rpms. thanks for all the input.... :banana: