What rearend for turbo car?

I am building another turbo car and trying to decide what rear to put under it. I have a 340 demon with a turbo and 8 3/4 with 3.23 gears i drive alot and i think it would be even quicker with 2.91 . this other car will be indy headed 440 with twin turbos so the 8 3/4 is out of the question. the only dana 60 gears i see are 3.54 gears and thats too low. I dont like the idea of running a 9 inch unless i have no other options. I want something around 3.08 or 3.23. what would be my best option to keep it all mopar?

A Dana 61 out of a first gen Diesel Dodge could be had with 3.07 gears.

Kind of like a Dana 60 but without the aftermarket support.

How heavy is the car?

Kevin

The dana being referred to is actually a 71. No real good parts available for it.

I would (and have) gone with the strange ultra case. The standard ultra case takes a true 9” gear, but the pinion shaft can be upgraded to a large 35 spline configuration. This particular setup will allow down to a 3.40 ratio. If you upgrade to the 9.5” gear set, you can get a ratio as low as 3.2. These are pro gear sets.
Running low ratios is extremely hard on everything in front of the rear end. Plan on spending a whole lot on trans parts.

I agree...as die hard mopar as i am...the 9" is your best bet if you need a gear that low in ratio.

Either that or taller tire/more cam/more mph/RPM.

Dana makes the 61,71 and maybe even the 81 series with the 3.54 and higher sped ratios. The 61 first came in the Ford 3/4 ton trucks with a 3.30 ratio, later in the Dodge pickup CTD trucks as already mention with the 3.30 and 3.07
One of the local scrap yards has both, maybe I should scoop both of them up for future builds

The only CTDs that had a 61 axle were the “W” (4wd) and they were front axles. All pre overdrive CTDs had rear 71s otherwise known as D70U. The only difference from a standard 70 was an internal “U”ndercut for the large pinion gear tooth clearance. Not a good rear for performance by any means. The reason I know this is I have seen more than my fair share, and had to source parts for them.😉

I tried to find something shallower then a 3.54 for my car. The rare 3.30 and 3.07 stuff is hard to find, and if you break one good luck finding another one.

I just gave up and went with the 3.54. It's not bad...142mph on 28" and only crosses around 6500.

If you're starting from scratch just go 9".

Me thinks your confusing the Dana 60-2(they have the 60-2 cast into the housing above the pinion shaft ) 4x4 front ends with the Dana 70, some of the later 3500 CTD trucks came with some version of Dana 70 up front and Dana 80 in the back
I'm going to do some research on those 61 carriers to see if they will accept the Dana 60 35 spline clutch type posi internals

Is Dana really Mopar or are you confused. Lmao.

http://www.dana.com/corporate-pages/history

Yes. Do some research.
As previously stated, all pre overdrive CTD trucks had 70U/71 rear axles. The only exception is the very rare 4:XX to 5:13 dana 70 in military lot tugs.

The Dana 61 rear did come in ford trucks with a 3.07 gear, and a series 3 Dana 60 differential should work in it. That way you can run a spool in the Dana 61 as long as you use Dana 61 gears.

Touche, Essay
You be right Bro , Dana makes all of their parts for who ever wants to buy enough of them to warrant dealing with those companies.