Jag IRS questions.

[chrispy]

Bob,

I am in the VERY early planning stage at the moment. All on paper. I do have a question regarding the JAG IRS offering from ERA.

I am trying to stick as much as 800hp (not that much for sure, but using this number to be safe) through the Jag rear. Previous discussion here : Rear end ratings .


Today I just noticed that one of the options ERA offers is a partial rear end kit, where the customer supplies the "differential, brake calipers, hubs, bearings and labor ". I do take it that this is the ERA AL frame and setup for outboard brakes??? I also assume that this is offered for someone in my position.

So my question is, what would be the best pumpkin to put in there? I would assume that the Dana 44 would bolt in, so would a beefed up Dana 44 be the ticket (hardened gears,3:31 ratio, support cover)? Or how feasible would a 9" work, or is it even possible to fit? If so what would need to change, or how difficult of a task would it be?. Guess we could take it to the extreme and ask the same about the Dana 60?

What is the price on this kit as well? PM me this info if you need to.

What is the Cosby mobile running for a rear-end?

Thanks in advance,
Chris

[strictlypersonl]

Both our rear suspension designs are designed around the Jag/Dana 44 casting and gear set. The Ford 9" pinion is offset about 1.5" lower than the Dana. I've seen a customer's attempt at using one - the necessary modifications to the chassis were not, IMHO, structurally acceptable.

Because of the car's light weight, you can only put so much torque through the axles before wheelspin. Adding a HD spider and 30-spline inner axles should keep everything together. The "Cosby" car is outfitted that way.

The price for the ERA rear suspension kit is about $3000.

[chrispy]

Bob,
Thanks for the info and quick response. Once again I am reminded of the light weight and the tires breaking free.

I am to assume that I would need a complete pumpkin, hubs and breaks to make this work??? The one part that I am having a hard-time with (and please excuse my ignorance) is the 30spline axle to yoke part. Is this an off the shelf part, or would it need to be made? Also, am I assuming that the originals you are using are the 26 spline and not the older 10 spline?

With the great attitude you guys have down there, I am sure something could be worked out???


Thanks again,
Chris


PS please see other post were I offer my sister up.

[hoppy]

As mentioned in the Rear end ratings thread, by Ricki Lake, Mark Williams makes the upgraded 30 spline stub axels. I think he is in Michigan but not sure. Someone here will know. You will need to give him the details of exactly which rear end you are trying to upgrade.

[chrispy]

Terry,

Thanks for the help. Did not put those two together.

Sounds like mark might be the ticket. Does he have a website?

Thanks again,
Chris