Top speeds

[janvlen]

Manny's Transmissions still lists the Power Drive on his web page. Since it requires the transmission to handle the increased torque, I would be more inclined to go with a higher ratio final drive instead.

Transmission

Rebuilt THM425 Transmission Rugged and Reliable - T he Turbo-Hydramatic 425 was an automatic transmission developed and produced by General Motors from 1966 to 1978. The THM425 was originally...

www.mannystransmission.com

With both the engine and transmission moving the power and torque at higher revs, I would think that this arrangement would be easier on the equipment. When I revised my diff in my street rod to a 3.73. ratio, the transmission certainly liked it and rewarded me by not blowing up again>>>

 

[LQQKatJon]

So how does one know what FD they have? I'm not sure what had been done by they PO.

Only true way is to take cover off and count the teeth. Unless it is the 8 bolt cover 3.21.

Some are marked. Most are not. Sometimes blue paint might indicate a final drive change.

You can gps and watch a tach, but that will
Fool you too.

 

[Billygoat]

Hi I have just joined this forum , I’ve always admired theses Motorhomes. I have been researching on here and other places to better understand the vehicle before I buy one . Something that keeps coming up is that you can’t drive theses over 55 or 60 that the motors can’t take it ? I then read other claims it the hot rod of rvs . Which is it . I currently have a Ford e350 chinook and fully loaded I can do 80 ... not the best on mileage but no problem for the motor and rides fine.

Welcome, I try not to get over 65 on mine but it is hard to keep it there it keeps wanting to creep up to 70+.
As far as a hot rod of motorhome all I can say is when I first got it I was driving it out of my mom’s neighborhood and had to cross a busy 4 lane road with lots of traffic. Cars on my left were easily seen but the other 2 lanes of car to my right come up over a hill. So I started out to cross and sure enough 2 cars come popping up over the hill. I panicked and punched it, smoked the front tires and yes got over the road in quick order. Never realized these motorhome could smoke their tires, funniest thing.

TG

 

[Matt Colie]

Gee, you just figured that out.
When you have been driving longer, you will start to get annoyed by that 4-wheel in front of you that won't get up to speed so you can cruise.
Happens to all of us.
Matt