4L80E First gear question
Thread Starter
Launching!
Joined: Jun 2004
Posts: 252
Likes: 0
From: Kansas
4L80E First gear question Well I understand that the 60E has a higer first gear that the 80E. FLT has a 2:75 first gear option. When I get the trans, if I dont opt for the gear option(2:75) how much difference is there going to be? If converter size matters then it will be a 4200-4500.
I just dont want the car to be a dog off the line. Thanks
I just dont want the car to be a dog off the line. Thanks
4L60E/4L65E/4L70E/700R4
1st 3.06:1
2nd 1.63:1
3rd 1.00:1
4th 0.70:1
4L80E/4L85E
1st 2.48:1
2nd 1.48:1
3rd 1.00:1
4th 0.75:1
TH400/3L80
1st 2.48:1
2nd 1.48:1
3rd 1.00:1
TH350/TH350C
1st 2.52:1
2nd 1.52:1
3rd 1.00:1
200-4R
1st 2.74:1
2nd 1.57:1
3rd 1.00:1
4th 0.67:1
1st 3.06:1
2nd 1.63:1
3rd 1.00:1
4th 0.70:1
4L80E/4L85E
1st 2.48:1
2nd 1.48:1
3rd 1.00:1
4th 0.75:1
TH400/3L80
1st 2.48:1
2nd 1.48:1
3rd 1.00:1
TH350/TH350C
1st 2.52:1
2nd 1.52:1
3rd 1.00:1
200-4R
1st 2.74:1
2nd 1.57:1
3rd 1.00:1
4th 0.67:1
TECH Senior Member
Joined: Apr 2002
Posts: 6,080
Likes: 17
From: So.Cal.
This puts 1st gear closer to 2nd gear, so engine RPM will drop less on the 1-2 shift (higher RPM = more torque to start pulling in 2nd).
2.75:1 is lower than 2.48:1 so you'll still get more pull off the line.
2.75:1 is lower than 2.48:1 so you'll still get more pull off the line.
Thread Starter
Launching!
Joined: Jun 2004
Posts: 252
Likes: 0
From: Kansas
Originally Posted by joecar
This puts 1st gear closer to 2nd gear, so engine RPM will drop less on the 1-2 shift (higher RPM = more torque to start pulling in 2nd).
2.75:1 is lower than 2.48:1 so you'll still get more pull off the line.
2.75:1 is lower than 2.48:1 so you'll still get more pull off the line.
ahh. I see. So would it be worth getting? It is a $500 option.
Thanks guys for all the responces and help!
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i read (dunno if its right or not) that for some unknown reason, you cant use it with a stock/modified stock pcm...dunno if it throws off the speedo/shifting stuff or what. Who knows what the calibration stuff for the 4l80e has that we dont see. If it can be done, I would only do it for mileage. It does drop your city mileage with the 2.48 1st gear. As far as the track, my car went exactly the same times with the 4l60e vs th-400 (same 1st gear as 80e)...60' the same...330 the same and all...I was surprised. Like i said...research it and do it for mileage only.
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TECH Resident
Joined: Mar 2005
Posts: 943
Likes: 0
From: Texas
The 2.75 first gear is great, it helps a lot. I have the lower first in my Camaro but the tranny has its own computer. I would like to add the lower first gear to my truck, but I am not for sure if the oem computer can be programmed for it.
