dana 36 vs dana 44

[grumpyvette]

DANA 36 vs DANA 44
yes LOOK THRU THE POSTED LINKS
http://www.joby.se/corvette/mods/2001-0X11_diff/

http://www.joby.se/corvette/mods/2004-12-26_4l80/

http://www.vetteweb.com/tech/vemp_0909_ ... index.html

http://www.drivetrainspecialists.com/ca ... ndp-1.html

http://ratech.stores.yahoo.net/coax84d36sed.html

http://www.justdifferentials.com/index. ... ts_id=1773

http://www.vette2vette.net/ usually can supply complete rear differentials

http://www.mamotorworks.com/corvette.ht ... ar%20gears

2 series corvette differential carriers (you have a 2.73:1 rear gear)
generally require a thicker gear to run a 3.54:1 gear set)

https://www.yukongear.com/partslist.aspx?SearchMode=Diff&Type=Dana&DiffID=124&DiffName=Dana+36&CatID=35&CatName=Ring+&+Pinion+Sets

https://www.usgear.com/products/ring-and-pinion/dana-36-3-54-corvette-2-73-down

https://www.drivetrainshop.com/Dana_36_ICA_s/86.htm

https://www.richmondgear.com/auto-parts-product/?crt_differentialcasedesign=dana+36

https://www.jegs.com/i/Richmond-Gear/836/49-0143-1/10002/-1

https://www.corvettemods.com/C4-Cor...ing-and-Pinion-Gear-Set--Dana-36_p_14606.html

http://www.ronsmachiningservice.net...a-36-ica-3-73-ring-and-pinion-yukon-gear-set/

https://www.zip-corvette.com/84-96-3-54-dana-36-ring-pinion-2-series-carrier.html



https://www.pirate4x4.com/articles/tech/billavista/Gear_Setup

https://www.strangeengineering.net/...rvette-3-73-for-3-54-and-higher-carrier.html/


This is from Graham who frequents this sight often. I think something like this should be a part of this sight if possible (are you listening Rob) it is that well presented.

Again, I did not put this together, but I wish I had it is that good.

"Ok, seeing as how this comes up a bit with "What is the speed/rpm with a given gear?" Here's the answers I got when doing the math for my gear change.

Assumption: Tire Diameter = 25.7in (275x40/17), Drive Ratio is 1.0, Overdrive Ratio is 0.7 (this is for an auto of course). 5400rpm is max with factory PROM/Chip.

In Drive (ratio is 1.0)

Ratio 2.59 3.54 3.75

MPH RPM RPM RPM
----- ------ ------ ------
45 1524 2083 2206
55 1862 2545 2696
65 2201 3008 3187
75 2540 3471 3677
85 2878 3934 4167
95 3217 4397 4658
105 3555 4860 5148
115 3894 5322
125 4233
135 4571
145 4910
155 5249
165

In Overdrive (Ratio is 0.7)

Ratio 2.59 3.54 3.75

MPH RPM RPM RPM
----- ------ ------ ------
45 1067 1458 1544
55 1304 1782 1888
65 1541 2106 2231
75 1778 2430 2574
85 2015 2754 2917
95 2252 3078 3260
105 2489 3402 3604
115 2726 3726 3947
125 2963 4050 4290
135 3200 4374 4633
145 3437 4698 4976
155 3674 5022 5319
165 3911 5346


The formula works as follows:

For Drive (ratio 1.0)
RPM = ((RE Ratio * MPH) / Tire Diameter) * 336

For Overdrive (ratio 0.7)
RPM = (((RE Ratio * MPH) / Tire Diameter) * 336) * OD Ratio

So if you want to calculate different rear gears or final drive ratios just plug it into the formula. Or use the tools on this website or many others.

Graham

http://www.jegs.com/i/Richmond-Gear/836 ... tId=750830

http://www.summitracing.com/search/?key ... ears&dds=1

http://vette.ohioracing.com/axle.html

http://www.richmondgear.com/07Apdfs/page7.pdf


The C-4 Dana 36 was the only axle available in 1984 Corvettes. In 1985, Chevrolet brought out the Dana 44 which was similar to the 80-82 Corvette axle, but not interchangeable. The Dana 44 axle is considerably stronger, but not indestructible. The Dana 36 and the Dana 44 (44's in some autos and all manuals) axles were used through 1996.

The Dana 44 is much larger than the D36. The 44 has a larger, "beefier" carrier/components to handle larger (lower) ring and pinions, and increased torque. NOTICE THE LOCATION OF THE TOP CENTER BOLT HOLE ON THE DANA 36 THATS NOT ON THE DANA 44 REAR, thats a QUICK WAY TO TELL THEM APART

603967 GM 44 REAR 1980 CORVETTE
605172 GM 36 REAR 1984 CORVETTE
605180 GM 36 REAR 1984 CORVETTE
605220 GM 44 REAR 1985-87 CORVETTE
605239 GM 36 REAR 1984-86 CORVETTE
605260 GM 36 REAR 1985-87 CORVETTE
605321 GM 36 REAR 1988-90 CORVETTE
605322 GM 44 REAR 1989 1/2-90 CORVETTE
605365 GM 44 REAR 1988-89 CORVETTE
605417 GM 44 REAR 1990-90 1/2 CORVETTE
605490 GM 36 REAR 1990 1/2-96 1/2 CORVETTE
605491 GM 44 REAR 1990-96 1/2 CORVETTE
605492 GM 44 REAR 1990 1/2 CORVETTE


Look at the size difference, especially at the case above the yokes:

dana 36

DANA 44

notice only the dana 36 has an upper center bolt on the cover housing
And visit

ikerds.com

Who were kind enough to supply the pics

BTW if you think your corvettes dana 36 or dana 44 independent rear differential will stand up to a Healthy small block with nitrous or a well built big block engine swap,once you used slicks with decent traction, you might be rather shocked, at what might result.

 

[grumpyvette]

installing a D44 .

Tom's Diffs is popular with the C4 strip crowd

http://www.tomsdifferentials.com/catalog.asp?pg=32

http://www.tomsdifferentials.com/catalog.asp?pg=33

Denny's for bullet proof halfshafts
http://www.dennysdriveshaft.com/c29_corvette.html

Some reading
http://forums.corvetteforum.com/c4-tech-performance/1952927-dana-36-vs-dana-44-realistic-limits.html

http://forums.corvetteforum.com/c4-...o-dana-44-while-rebuilding-it-for-racing.html

Why can't you rebuild yours with new gears?
http://www.vette2vette.net/ usually can supply complete rear differentials

Bearing/ seals runs around $130 /
http://ratech.stores.yahoo.net/coax84d44.html
$60 for new posi clutches
http://www.drivetrainspecialists.com/categories/dana/dana-44/products/product-446.html
New gear set
http://www.corvetterecycling.com/product_p/d44hd-373-oe.htm
http://www.justdifferentials.com/in...duct_info&cPath=22_31_86_501&products_id=2776

+install costs

Still cheaper than buying a unknown used unit ?

 

[grumpyvette]

All Manual transmission cars from 85-96 have the D44 rear axle.
All 84s and all automatics have the D36 rear axle.

LUBE FILL CAPACITY
IT says two quarts, because you buy the oil in quart containers but it will start draining from the site, or full level upper hole at about 1.5-1.7 quarts, depending on the year corvette when its filled.
remember place the transmission in neutral before lifting the car on the lift, to allow you spin the wheels a few times to distribute the lube while filling the differential (one more reason two post lifts tend too better in shops where you do drive train work on cars)

Dana Corp says that the factory gear oil is adequate, but synthetics are superior especially when heat is an issue. A limited slip additive should always be used. (2 bottles) Gear oil should have a GL-5 rating and a 75w-140 or 75w-90 weight, with 75w-140 being the preferred weight.

RPO Codes:
G92: Performance Rear Axle Ratio, means nothing really.
GU2: 2.73 verts option from 86-93 with G92
15 pinion teeth, 41 ring teeth, 7.875" ring gear outside diameter
GM1: 2.59 standard rear for D36 cars
17 pinion teeth, 44 ring teeth, 7.875" ring gear outside diameter
G44: 3.07 standard rear for 4+3s, option on A4s
3.07:1 ratio: 14 pinion teeth, 43 ring teeth, 7.875" ring gear outside diameter
3.07:1 ratio: 14 pinion teeth, 43 ring teeth, 8.5" ring gear outside diameter (manual transmission)
GW4: 3.31 only for 84s with Z51 only
GT7: 3.33 available on Late-89-90 6speeds
GM3: 3.45 standard rear for later 6speeds
GHO: 3.54 available on early-89 6 speeds, and as an option on a few later years.

Description: Overhung pinion gear
Limited slip differential type: Standard, disc clutches
Drive pinion offset: 1.50" (8.5" ring gear), 1.125" (7.87" ring gear)
Drive pinion type: Hypoid
Number of differential pinions: Two
Pinion/Differential bearing adjustment: Shim
Driving wheel bearing: Tapered roller
Lubricant capacity: 3.75 pt
Lubricant type recommended: GL-5 gear lubricant
Lubricant SAE viscosity: 75W-90

Dana Corp says that the factory gear oil is adequate, but synthetics are superior especially when heat is an issue. A limited slip additive should always be used. (2 bottles) Gear oil should have a GL-5 rating and a 75w-140 or 75w-90 weight, with 75w-140 being the preferred weight.

D44=8.5" ring gear
D36=7, 9/16" ring gear, some books list it as 7.75"
More D44 & D36 specs and replacement parts
Output Torque Ratings-
Max Continuous- 36=850 lbs-ft 44=1,100 lbs-ft
Max Short Duration- 36=2,800 lbs-ft 44=3,460 lbs-ft
Ring Gear Bolts and Size- 10 x 3/8 in.(both)
Pinion Shaft Max Diameter- 1.375 in.(both)

D36+batwing weighs 71 pounds/32.2Kg
D44+batwing weighs 77 pounds/35.2Kg

heres the main point I worry about, its durability once you install a serious engine, and its the fact that I,ve shredded several 12 bolt rear differentials in the past in camaros, chevelles and similar cars and when you break a stock 12 bolt rear axle the wheels come off the car.
the hot ticket was supposed to be a 9" ford with aftermarket axles, but Ive busted those also.
Ive used dana 60 rear differentials in most of my serious race car builds and have never yet hurt one even with a 750 hp/700 ft lbs torque nitrous big block running slicks

http://garage.grumpysperformance.co...ette-auto-thin-ore-thick-gears-on-3-54.15589/