trans upgrade
it looks like we are going to have to wait to upgrade to a newer MH so I would like to upgrade the Turbo Hydramatic 400 to the 700R trans. Has anyone done this here? Seems at 65 mph its topped out, so...
Forum Discussion
Lift one rear wheel off the ground and count how many times the drive shaft goes around for one turn of the wheel. Then double that number, because you are only turning one wheel instead of both. That will tell you your diff ratio.
The other way to come up with the correct answer is what RPM are you turning at 60 mph?
BTW: The 4L85e will be a little nicer at .75 overdrive, than .7 overdrive of the 700R4.
And just so you know what the designations stand for, the 700R4/4L60E the "60" means it was originally designed for vehicles with a combined weight rating of 6000 LBS, the 4L80E was originally designed to support vehicles with a combined weight rating of 8000 lbs. The 4L85E - the "5" designation stands for 5 planetary gears instead of the standard 3, and is rated for vehicles up to 16,000 lbs. Hmm, which one do you want in your motorhome?
The other way to come up with the correct answer is what RPM are you turning at 60 mph?
BTW: The 4L85e will be a little nicer at .75 overdrive, than .7 overdrive of the 700R4.
And just so you know what the designations stand for, the 700R4/4L60E the "60" means it was originally designed for vehicles with a combined weight rating of 6000 LBS, the 4L80E was originally designed to support vehicles with a combined weight rating of 8000 lbs. The 4L85E - the "5" designation stands for 5 planetary gears instead of the standard 3, and is rated for vehicles up to 16,000 lbs. Hmm, which one do you want in your motorhome?
