Found a place Duntov motors that will send me a rebuilt differential which I getting 3:54 gears to replace the 2:87 gear,anyone familiar with them,but the guy says he thinks they are the only company rebuilding these rear differential,

 

I bought a used front spindle from them a few years ago. Very happy with the product.

 

Several places sell rebuilt differentials. I had my diff rebuilt by VTEC corvette, good folks.

 

If @GTR1999 is accepting clients, I'd send it to him. He did a great job on my steering box.

If he's too busy, Bair's can do it, and possibly VanSteel.

http://www.bairscorvette.com/service...ltrearend.html

 

Seconded. It's get Gary to do it or bite the bullet and diy (as I did) in my opinion.

 

I don't think Gary does the aluminum diffs.

 

I should have caught the 2.87.

No, I don't think he does, but he can help with an iron diff / aluminum batwing hybrid.

 

I got my 3.54 differential unit for my 1980 from Duntov last October and installed it in January. No complaints. I also got new halfshafts and a batwing cover from them at the same time. They are only a couple hours from me so I didn't have to spend lots of money to ship my core back to them. They gave me a tour of the shop in February when I brought my stock diff back to them. Super nice people. The Sevadjian family that owns/runs Duntov also race in SVRA and in the Trans-Am series.

 

this interests me. does it bolt up or machine work needed?

was it an alum dana 44 or had iron?

thanks guys

 

Hi guys,
Thank you for thinking of me.
Just some thoughts.
1- The poster called me a couple of weeks ago and has options, none of which are cheap. I would drive the car as is and enjoy it.
2- I strongly suggest you do your research on the Tx vendor.
3- I can do 80-82 DANA but my policy has always been to be honest and most know what I think of those diff's. I wouldn't drop a dime on them, but they can be rebuilt and if it's just a driver they'll be ok. Bairs, Van Steel, Vtech, Harvey Jacobs and others will do them. The fact the Tx vendor thinks they are the only ones rebuilding them should be a red flag tip off, but I'll leave that to you. I have some pictures of some of their diffs that ended up in my shop.
4- Iron conversions cost more up front but offers more options and a stronger unit. I have been doing them for years as have others.
5- My personal opinion- if I owned an 80-82 I would build and iron unit to the level of the engine and usage. I gave away all my DANA parts and cores years ago. They have the same issues with soft faced axles, clutch retainers stick out and get chewed up, aluminum bearing caps, and the parts are smaller than the irons. Many will argue they are great and hold up, good- happy to hear it and have heard it for many years. Again, this is what I would do if I owned an 80-82- rather than put money into the DANA. DANA also supplied the posi in the 63-64 too, they were junk.

 

hello,
what is involved to mount an iron diff with the dana 44 batwing?
thank you.

 

You need to get the parts from a 79 or older- diff, strut rods, 1/2 shafts, brackets, outer axle flange. The driveshaft may need to be machined or replaced.

 

Thanks,but if I had to do all that,I would just leave the 2.87 gear in it,the car only has 80k miles,And the last 15-20 years has around 5-6 thousand miles on it,although can tell the seal is leaking at the half shaft on drivers side.and you included Gary,don’t even mess with them,as several other companies with this aluminum Dana and Duntov Motors or Duntov Classiic, have Rebuilt with 3.54 gears for $1,500. Ready to put in.I know that sounds like a lot,but if I had to change everything to do a cast iron switch it would cost me three times that much not to mention five times more work,for what,I just did a little work to my engine,and guessing I might be just over 300 hp,versus the 190 I had,so I don’t NEED a 500-800 hp rear end. But,thanks for your advice.I appreciate all the info though.

 

FWIW - my experience with the TX vendor. back in 2011 i think i wanted to upgrade from the 3.36 rear to 3.70's. they had a good price delivered so i purchased one. well it howls a little during steady state cruise and is quiet during acceleration and deceleration. so i called them about it. they were very nice to deal with and i told the top guy there just build another one and i'll pay you for it and then give me a credit when i send the first one back. he ended up telling me i'll just send you one no charge and send the first on back when you get it. i gave up after that. never got the replacement diff. i've just been driving it for the last 10-12 years they way it is - hasn't exploded yet. now the plan is to send it or my original 3.36 to someone like GTR1999 to get the super 10 upgrade one of these days. not trying to trash the vendor just suppling feedback in case the op wants it.

Pat

 

I have an aluminum Dana 44. I did not go with an Eaton/Dana hybrid setup.

 

Well,I received my differential with 3.54 gears,they said 5-6 weeks,I think it took only 24 days,and even though it might be a while before installing it,everything looks real good,as far as visual,so I am very pleased so far,was in a box,and well protected.

 

I ordered a diff from duntov for my 81. 3:54 gear to replace the 2:87. 4 months went by with no contact. After many phone calls they delivered. This all took place during the fake pandemic.
So far no issues other than the howling. Dang car howls like a Porsche gt3. I must admit the gear change makes the car way more fun to drive. With the 200 R4 trans at 70 mph running 2000rpm

 

Diff is howling and that is acceptable for you? A certain amount of gear noise can be expected, nothing that would be considered a howl. "After many calls they delivered", not so sure the pandemic is what's fake.

 

Thanks for the response Gary. Maybe the correct word is whining.

 

decent web site.
are they worth bookmarking for future parts?