My new 40 axles have 4.88s I like the 4.10's. I don't drive the 40 on the road much so the 4.88 will work well.
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Just some information gearing wise. Had my 40 out the other day after doing some transfer case work on it and noted that at 60MPH (GPS verified, my speedometer is a Dakota Digital that is easily calibrated) the engine is turning 3000 RPM. The truck has 4.88 gears in the axles and it's running 35" tires. I've never really gone over 65 MPH with the old girl as I try to avoid running the 2F much higher than 3200 RPM.
Over the last few years I've thought about swapping the 4.88's out for a pair of 3.70 third members. It would sure make it easier on the engine running down the highway. S.
(snip)@Pacer would want the 4.88 3rds. Although unless he is swappig motors 5.29's would be better for him on the treker
Has fj60 axles.Has FJ60/62 axles, 4.88 gears.
For a daily driver, a 3FE equipped 80 with 4.88 gears and 33s is pretty good. I ran this way for years on my 91. 33s on the street and 36 Swampers on the trail.Yeah, I'm trying to figure out what to buy. My transfer case is shot in my 91 80. Mechanic has not got in any further, but metal came out of the oil in the transfer case, but no transmission fluid! So I think my trans is okay. I'm scouring info on Marlin. I've heard low low is what I need. I have 33's now but will be going to 35's.
Mmm, 36" Swampers.For a daily driver, a 3FE equipped 80 with 4.88 gears and 33s is pretty good. I ran this way for years on my 91. 33s on the street and 36 Swampers on the trail.
If you want to run 35s on the street, I would go with 5.29 as that will keep you in the torque band and help offset the additional weight.
I run 35s and 4.88 on my LX450 and it can almost get out of its own way, but it has more available ponies.