Differential Swap 3.08 to 2.73

Ant929

New member
15
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Location
Jupiter, Florida
So I have a M1165A1 with a 3.08 Diff. When I was buying it I thought I was going to be able to drive over 55 mph but I was wrong. Does anyone know if it would be possible to buy 2 sets of ring and pinions and have them installed? I think that would get me to 70 MPH. the truck is not going to carry armor anymore.
 

NDT

Well-known member
Steel Soldiers Supporter
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Camp Wood/LC, TX
Go drive it. Verify it is shifting 1-2, 2-3, 3-4. If it’s not you are in limp mode which explains the 3000 rpm @55. Limp mode is second gear only. Limp mode happens when the transmission has issues.
 

NDT

Well-known member
Steel Soldiers Supporter
8,470
1,217
113
Location
Camp Wood/LC, TX
It’s definitely shifting 1-2,2-3,3-4. What type of RPM should it be at with a 4.08 differential and 4l80e?
Member "ACTION" reports: I get 2000 rpm @ 50 mph, 2700 rpm @ 70 mph with 6.5 TD, 4l80e, 3.08 diffs, and 37” tires
 
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