JoeNova

So I'm delaying swapping out my D36. I was either going to swap in a stock D44 or finish the IRS 8.8 swap I started (I have batwing/C-beam brackets made already and pinion adapter, just need to sort out axles).
Unfortunately, I'm out of funds because I'm having a house built and doing repairs to my current one getting ready to sell, so the rear swap will wait.

What is the quickest/fastest anyone has been on a stock IRS D36? Its a 3.07 gear which works perfect on the street with my TH400.
Thinking about seeing what can be done before swapping it out. Power is a non-issue.

Pwnage1337

Following because i soon will have rear end longevity issues

84 4+3

Iirc it all depends on how hard you hook up. Lazy 60 and street tires = happier diff. Drag radials and a hard launch = pieces on the ground. Some people are lucky some aren't. There is no hard and fast rule unfortunately.

JoeNova

Was more interested in actual times. I'm not worried about the launch. I can set 2 step/brake and traction/boost control strategies to baby the launch.

Anyone have an actual ET for fastest D36?

84 4+3

My bad. I seem to recall someone in the 10/very high 9s area... but I think they beefed up the gears, yolks etc. That was digging back though and I think it still ended up spilling its guts...

383vett

That would definitey not be a 36.

84 4+3

Fair. All I remember was something about cryogenic treatment and something. With the crap I got going on right now I'm lucky if I remember my name being honest...

383vett

My 84 4+3 came with a 36. Sometime decades ago I broke this and broke that and bought the best parts to make it as "bulletproof" as possible. After spending good bucks and blowing yet again, I went to a 44 and now a 12 bolt.

84 4+3

Hard to break a 12 bolt. And yea, good parts =/= reliability. I fear for the 36 in my 84 just having the manual everytime I don't get a smooth shift and kind of jerk it.... D44 is better, 12 bolt even better and a 14 bolt would just be overkill.

65Z01

Best my prior 35th Anni did was: 13.02sec 1/4mile, 1.82sec short time and 105mph. That was at Englishtown with an extremely good DA.

bjankuski

I doubt this is the best but I ran a best of 11.82 at 114 with a 3.07 dana 36. That run was a 1.55 60 ft. I pulled the dana 36 out and went to a 3.45 dana 44 after that. I assume the dana 36 was on bowered time abd did not want to break it. Just because it did it once does not mean it can do it all the time.

I did run many runs in the low to mid 12's with the Dana 36 at 1.7 60 ft times.

JoeNova

Pete K has the best I've seen with a 10.97 @ 126.

I've seen a couple of "My buddies dad's step-brother's car has ran low 10s".

rklessdriver

A few people that managed to make a few good passes is not something I'd use for evidence of the D36 being capable of standing up to any power and traction....... A lot of this stuff was done when these cars were fairly new and before people knew any better. Fact is the D36 junk for drag racing.

A customer and friend of mine went low 12's on a D36 back in the early 2000's....... It made a few good hits and then broke the drivers bearing cap in half.... This was on legit Michelin street tires...... What's left of that D36 is still in a milk crate in his garage as a reminder.....

But by all means, be the guy that oils the track down with 75W90.....
Will

JoeNova

So much negativity lol.

My car weighs 2300 lbs with enough traction control and boost/timing control adjustments that I can damn near decide a 60' time and run it.
A 1.5 60' in this car would be comparable to a 1.7-1.8 60' in a full weight car.
I'm not looking to make it last forever, just until I get the chance to swap it out. Its not as if local D44s are a common thing.

The car made ~600whp through a TH400 with a stock converter on low boost (half as much boost as I'm able to run).
There's probably another 200whp available there, but I was only on the dyno for 2 pulls to test for fueling issues.

drcook

That is one of the strength differentials the D44 has, bearing cap support. One of the folks in the club races SCCA and had a cap break in his D44. But the added brace/support lug in the D44 batwing kept it in place. He didn't even know it was broken until doing maintenance on the rearend.

Zip Corvette was selling modified D36 batwings using components that they got from Ikerds (welded in support lugs). However they ran out of parts and the old guy making the blocks passed away. The last I heard, they were currently working on a redesign, but had no ETA.

One of the modified covers would have worked for my purposes, but since no ETA, I went ahead and bought a Dana 44, with C-beam, driveshaft and batwing. They are not hard to find and not that expensive to ship to Ohio. The whole thing was shipped to me (just outside Akron,OH) for less than 100 from Mississippi.

The place I purchased mine from has more.

TravisSchoech

a 2300lb C4? ... I'm guessing this is a vette kart?

JoeNova

Yes.

qwiketz

I'm pretty sure I've heard of 11:30's with a 36 on a street car. The weight will help alot.

cv67

DIdnt skidwnit cryo those years ago?
12 bolts are good,,,,9 inches very strong but sap a little more power. Wonder if anyones used an 8.8 Ford? THey take a surprising amount of abuse.
Had one in an 85 GT with a 460 on squeeze...moaned and groaned but never broke. If only I could weld

BLKMAMBA

318 RWHP 2800 stall