Would like to change first gear in a 4L60E
Would like to change first gear in a 4L60E Does anyone make a different ratio first hear for the 4L60E?
I'm not a big fan of the 3.06:1 first gear ratio and would like to get closer to a 2.8:1 or 2.7:1.
I know that different ratios have been made for other transmissions and didn't know if anyone made the for the 4L60E.
Any input would be appreciated.
Thanks
Craig
I'm not a big fan of the 3.06:1 first gear ratio and would like to get closer to a 2.8:1 or 2.7:1.
I know that different ratios have been made for other transmissions and didn't know if anyone made the for the 4L60E.
Any input would be appreciated.
Thanks
Craig
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Joined: Aug 2010
Posts: 7,323
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From: Ann Arbor, MI
A different 1st and 2nd gear ratio is available; I have it in my car now.
1st is 2.84 and 2nd is 1.57.
It is implemented with a custom billet 6-pinion front planetary set.
IIRC FLT has it as an option on their Level-7 for an additional $1200.
PATC also sells it.
1st is 2.84 and 2nd is 1.57.
It is implemented with a custom billet 6-pinion front planetary set.
IIRC FLT has it as an option on their Level-7 for an additional $1200.
PATC also sells it.
Moderator
Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
Sorry, I don't have track times before and after; for one thing I rarely can get my car to hook well and therefore my ET is very inconsistent. Also I made too many engine/tuning changes to compare trap MPH before and after.
I'm thinking about changing the gear ratio because I'm concerned about hooking. With my new 408 I should be making 600rwhp.
If you are still having hooking problems then do you think it was worth it changing the ratio?
If you are still having hooking problems then do you think it was worth it changing the ratio?
Moderator
Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
At 600rwhp you really should be considering a 4L80E which has a 2.48 1st gear which will help you hook at the start. Of course mostly for its greater strength and durability.
I do like the closer ratios in my 4L60E in street driving; mostly it was part of my goal to experiment with all the significant aftermarket parts for this trans. Just a hobby for me.
I do like the closer ratios in my 4L60E in street driving; mostly it was part of my goal to experiment with all the significant aftermarket parts for this trans. Just a hobby for me.
