so i blew my diff last week. when i say this i literally mean i was doing a first gear pull from a 10 mph roll and bang. tore it apart and the traction lock carrier is cracked all the way threw on one side. the spider gears are all torn up to. im just going to replace it all most likely with a kit from summit racing. im thinking of going with a 3.73 gear do any of you guys run that with the eaton swap and how is it?
eaton swap with gears
- Thread starter 71catruck
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Are you still running the stock T45? If so, I'm surprised that didn't grenade first. With the Eaton you definitely don't need as much gear as with the N/A 4V. 3.73's would be a good choice or 3.90's if you really want some twist.
Some Terminator guys will run 4.10's but they also have the T56 that has a much taller first gear.
Some Terminator guys will run 4.10's but they also have the T56 that has a much taller first gear.
Trust me I'm surprised to but I pulled it apart and saw the damage. I'll try and link the pic today. It's bad though. I have a t-56 I hope ill be able to put in in the next year anyways.
Yup, it happens. It's possible the case deformed and caused the gears to break. Make sure you get a reinforced diff cover or a Billetflow brace when upgrading.
With the T-56 you should consider a steeper rear gear (3.90's or 4.10's) then since it has a 2.66 first gear vs a 3.37 in the T-45
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i dont want to go to steep because of the eaton swap first gear is almost useless under boost.
I wouldn't go steeper than a 3.73 with the eaton. Personally I think 3.55's are a good gear for the eaton/t-56 combo. But I'm not a strip hero. I spend my time on the street.
If you don't have a Billetflow brace I have one I can let go.
If you don't have a Billetflow brace I have one I can let go.
my car hardly ever sees the strip but the t-56 i have is out of an lt1 trans am and has a tall first and second gear. i have the full mm rear grip box im not sure why it blew to be honest. im not even running a drag radial its a 295 kdw. any info on were to get a rebuild kit though. and im having a hard time finding a 28 spline carrier
What is your first and second gear? Does the MM kit include a diff brace?
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lol ill bet first is a joke for me with 373s on the street. even a prepped track is a handful
This...
3.73s feel pretty good in my car. I can drive it around the street all day and cruise the interstate without too much noise or extremely high revs. I think at 65 mph I sit at ~2100-2200 rpm. I dont remember where I was with the five speed. I think it was at 2500. I know it wasn't that huge of a difference though
ok thanks guys. im getting a diff carrier this weekend from a friend then dropping it of for the rebuild and 3.73 next week. cant wait to see how they feel. then hop to get my ported blower and meth on soon.
Damn... Got 4.10's on my eaton swapped cobra... Have yet to get into the throttle yet.
4.10's in my Eaton Swap as well. One of these years I'll switch to 3.55's or 3.73's.
ok guys i finlly got my car back on the road.i went with a stock rebuilt traction lock and 3.73 gears. with my t-45 my rpm's are right at 2300 for 70 mph. the exhaust is actually a little bit quieter though so thats a nice surprise. im not sure on how it will affect my mpg but even with the being at higher rpm's im using less throttle to do so.
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