4.10's any problems w/long drives?

flames201

New Member
Dec 23, 2004
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st. amant, la
i'm putting in 4.10 next week and have a trip to mustang week planned. someone told me long drives will heat up the rear end more at high rpm's. that dosen't make much sense to me, but i thought i would ask some people who actually have them. :shrug:
 
not a problem at all. I speak from experience. I like the synthetic oils for the rear end but have never seen a problem with 4.10s or even 4.30s. I heave driven several hundred miles at a time with no problems .
 
i've driven from chattanooga to WV 4 times in the last two weeks & no problems at all. not to mention when i lived in WV i drove to orlando, FL every year with not a problem. heck i even got 320+ miles per tank this past week & that's with all my mods in my garage (filled up at between E & 1/4 tank)
 
100 mi. + trips non-stop whenever the wife and I visit either of ourt parents, no worries.

Remember, the only reason they put crappie gears in our cars is emmisions and fuel mileage. In the 60's and early 70's you could sometimes order up to a 4.30 gear from the factory (boss 429 drag pack)
 
I was a little fearful 4.10's would make my car a toy, and take away from the daily driver routine I bought it for.. but after having them for over a year now, I would recommend them to anyone who cares about acceleration. Driving for hours on the freeway is no problem, though I do drive a little slower now.
 
Did anyone monitor their transmission fluid temperature at highway speeeds? I know for a fact that my 4r70w with stock gears runs hotter at 85 mph than it does at 70 mph. I would attribute that to the faster rotation inside the transmission. Higher RPMs. If you have switched to 4.10s and still maintain your usual highway speeds, you're spinning the drivetrain faster.
 
I have no problems with 4.30's and long-all-day drives. Just use friction modifier with the gear change, make sure eveything is installed correctly, and if you want to reduce heat and wear, use a nice synthetic rear-differential fluid like the kind from Royal Purple or Amsoil.
 
propellerhead said:
Did anyone monitor their transmission fluid temperature at highway speeeds? I know for a fact that my 4r70w with stock gears runs hotter at 85 mph than it does at 70 mph. I would attribute that to the faster rotation inside the transmission. Higher RPMs. If you have switched to 4.10s and still maintain your usual highway speeds, you're spinning the drivetrain faster.

It sure wouldn't hurt to have a trans temp guage and a transmission cooler. I would if I had an auto with 4.10s.