I was wondering if a 3.45 gear set will fit into a D36 with 2.59 gear set? Thinking about replacing my 3.07 with a 3.45's and I have a chance to pick-up a complete D36 for cheap.

Thanks.

 

as long as the 3.45 is made for a 2-series carrier D36

but i dont recall 3.45 made for that, its a D44 gear, usually you have 3.54s

 

Thanks Vader....

I was thinking about getting some 1.7rr's, but I think the gear will give me more bang for buck.

 

If you have the complete D36 with a 3.45:1 ratio, at your disposal, what is the purpose of the question? They're in there, they must have fit.

RACE ON!!!

 

The D36 I'm looking at has 2.59's in it. I want to keep the original unit incase I decide to sell the car later. Plus it would make the swap easier.

 

I just did the gear in my 88, the only thing that will fit the 2.59 carrier is a 3.54 or 3.73.

 

What one did you end up going with? Hows driveablity?

 

I went with the 3.73, but not entirely happy with it. I do drive on the highway some and the 3.73 is a world of difference from the 2.59. My rpm's at 75 used to be around 2000, now they are around 2600. Runs a little hotter and naturally fuel mileage dropped. Bottom line is if you like to drive on the highway, you may not like that gear, only other choice is the 3.54, but can't imagine that would be much different.

Now if your looking to improve your seat of the pants feel, then 3.73 is the way to go. I can smoke the tires at will now. I went with the 3.73 because I am getting ready to do superram, brodix heads, lingenfelter cam and a Melrose full exhaust system.

I guess I'll just stay away from the highway.

 

Bob88, what tranny do you have??? 700R4? If you do those mods, I wonder if there will be enough gear to grab (1-3rd) in the 1/4? I will be curious...I know the 3.73 700R4 combo is supposed to be pretty mean.

 

I have never seen 3.45 gears for a D36. That is a D44 ratio. As it has been said, there are 3.54 gears available for the 2 series case, that is in the 2.59 diff. The next highest ratio is the one year only, 1984, G92, 3.31 gears. Not only aren't they a big enough change, they require a 3 series case, and they are rather rare.

RACE ON!!!

 

If your case has 2.59, you will need to go with 3.54. You will definately notice a big differnce. That's as much as I would go with a D36. It will feel like you gained 50 hp. Then consider a 2500 stall converter.

 

Same here. 3.54 = fun around town / sucks on the interstate.

 

Do you think I would feel a noticable increase from the 3.07 (which my car already has)??
As I mentioned before, just wanna keep the original rear incase I decide to sell it.
Or should I go with a nice set of rollers and springs?

 

My son has an 87 with the 3.07 gear. After he drove mine with the 3.73, he can't wait to get his changed.

 

This is for a 93 right?

Do both the rear and the TC, in either order you wish. If you drive alot on the hwy, i think you should go with the TC first and see if youre satisfied with just that, because it wont hurt your gas miieage and will still let you feel the kick off the line that gears do. Both together can make the LT1 almost a second faster in the 1/4mi.

 

You are correct. Dumb question.... What TC would be good and about how much is it??? $$$ is still kinda tight. Matter of fact, going to pull her out of storage this week.

 

PI Vigilante would be best, TCI, Yank, B&M should all be good.

2400-2600 stall preferably, and prices range considerably

 

This is true. Richmond specifically makes 3.54 and 3.73 for the series 2 carrier (2.59's carrier)

 

found at top of the page:


Differentials

This topic has been fodder for fights for a long time now! I hope we can clear the air on this subject once and for all.

In 1984, only the Dana D36 was available. It was used on both manual and automatic cars.

In 1985, the Dana D44 was released for use with the manual, ONLY. No automatics came from the factory with a D44 rear end.

The difference between the two is ring gear size, and the associated strength that comes with a larger ring gear.

The D36 has a 7.5" ring gear; the D44, an 8.5" ring gear.

The maximum ratio that will fit in a D36 is a nominal 3.73. After that, your taking your rear ends life into your own hands. The D36 has a power limit of about 450hp... but it won't last long on the strip, even then...

The maximum ratio for a D44 is a nominal 4:11. It will require some minor case machining to make it fit perfectly. The D44 is known to deal with over 650hp with no problems.

When drag racing, especially when the power levels get over about 600hp, the independant rear end becomes a handicap. At this point, it might be worth looking into a 4-link live axle setup, if this is the case, a Ford 9" is the best piece for the job.

At the time of this writing, a D44 is worth about $2000.00, complete (differential, casing, driveshaft, C-beam and batwing).

The best ujoints are the Spicer units.

As mentioned above (see Fluids), use two bottles of Differential Additive before adding the gear oil. This recommendation comes from Gordon Killebrew.

2.59 is the standard ratio for all automatics.
3.07 is an option, G44, but was standard for 85-88 L98 manuals.
3.45 is the standard rear for ZF6 LT1s and ZR1.
3.54 was offered off and on for the ZR1 and the LT1. Beyond that, it's anybodies guess.

 

one word of caution, I've heard Richmond gears are NOISY in a vette