Re: IML: 70 rear axle

[RandalPark@xxxxxxx]

I am not that scientifically minded, so I always think it is better to leave things that way that they were originally. Based on my experience with this, I'd say if that is what you want to do, go for it. I don't think that the difference in the RPMs is going to be that noticible power wise. You will have to change your speedometer gear to make up for it, though. 

I can easily see the reasoning behind the Sure-grip conversion, but I don't think that you can convert the standard differential. You may need to buy another third member that is Sure-grip to rebuild. You shouldn't have to change anything else. I have had Sure-grip installed in my cars without changing the axles. 

Given the more than ample power supplied by the engine in your car, it shouldn't be necessary to change the gear ratio to enhance your towing ability.

To show you how unscientific I really am, I will admit that when one of my Imperials needed a differential in 1984, rather than rebuild the original, I let a guy talk me into buying a 3.23 (non-sure-grip) which he had rebuilt knowing that it would slightly change the car's performance. What I noticed the most was that when the speedometer says that I am going 55, I am actually travelling down the road at about 62 MPH. My intuitive mind would like to think that the opposite would be true, but I guess you can't argue with facts. 

Driving that car on the freeway was one of the few times in my driving career that I scored a speeding ticket. I had added my usual 7 or 8 MPH over the limit,to the difference that was already there. I was stopped and told by the officer that I was travelling 66 MPH in a 55! I took his word for it and paid the ticket. I have never tested the car to find out the true speedometer error, or even if his radar may have been wrong that day and that possibly I wasn't speeding at all.

Paul

In an email dated Tue, 8 2 2005 12:22:15 pm GMT, <kmoore12@xxxxxxxxxxx> writes:

>Hey everyone, I have an issue with my rear axle that is tearing me up. I need to replace the bearings ( sounds like a church choir in my trunk ) and I would like to install taller gears and a limited-slip diff while I am in there. Here is my problem: I would like to go from the current 2.94 to a 3.23 for a little extra "go" and better towing capabilities. If my calculations are correct, that would be an increase of approximately 200 rpm at 65 mph. Will that increase make my highway hauler not so highway. My main goal with this car is road trips. And one last question: Is rebuilding an axle difficult? I rebuilt my transmission myself ( with a little help from my brother ) and that was easy.
>
> ?Keith
>
>P. S. I want to thank everyone for their support. I was asking a few weeks ago if I should keep her or set her up for adoption. As you can see, I am keeping the little @!&^%$(&^...........
>


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