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Rear end transplant question[ALL/1988] posted by Peter on
Saturday, 21 February 1998, at 10:30 p.m.
Howdy all,
In order to install a limited slip in my 940 wagon, I'm going to need to transplant an earlier model rear end (I suspect from a 740) into my car. The earlier rear assembly will accept a Dana 30 Powr-Lok - my current one will not. I have some questions I'm hoping you guys can answer:
1) The 940 has ABS and I would like to keep it if at all possible. Did 7XX cars come with ABS? What years or models?
2) Did any of the 7XX cars come with 3.5 to 1-ish gears?
3) Can anyone shed any light on the "swap-ability" of the 940 and 740 rear ends? They look the same but I haven't been able to measure them yet...
Thanks for any advice.
Re: Rear end transplant question[ALL/1988] posted by Rick Ewald on
Sunday, 22 February 1998, at 10:32 a.m.
You did not mention what year 940 you own. In the US Volvo used a traction lock diff as either standard equipt or option on 940's. The years that it was optional it was bundled as part of the cold weather package, with heated seats and out side air temp sensor. The point here is that you may all ready have an automatic diff lock.
To your questions, yes 7XX cars came with ABS starting in 1987. However 87 & 88 cars have a 96 tooth pick ring in the rear axle where as 89 and up (incl your 940 use 48 teeth.
There are two live axles used on 7XX cars the light duty 1030 axle used on early non-turbo cars and the 1031 heavy duty axle used on Turbos, V-6's and latter non-turbo cars (89 or so and up). The 1031 is also used in 940's.
I do not know what axle a Dana 30 fits in, but if it fits into a 1031 7XX axle it will fit into a 940 1031. If it only fits into a 1030 I would stay with the 1031 axle, and pursue a different solution.
Rick Ewald
Re: Rear end transplant question[ALL/1988] posted by Peter on
Sunday, 22 February 1998, at 11:08 a.m.
Thanks for your reply. I have a '93 940 and it does, in fact, have the Automatic Locking Diff as supplied by Eaton (I think) through Volvo. It won't come close to handling the type of HP I'll be putting through it. As well, it only locks to 25MPH and then unlocks - not good.
My car has a 1041 housing and axles. None of the Dana 30 stuff will bolt in. I dropped the whole assembly off at my local rear-end wizard's and he measured and tested and scratched his head and tried different diffs and nothing fits.
It sounds like a 1031 rear end is the way to go. Do you know if they all use 27 spline axles?
Re: Rear end transplant question[ALL/1988] posted by Rick Ewald on
Sunday, 22 February 1998, at 12:18 p.m.
Peter,
Sorry, it was early Sunday and I had not yet had enough coffee.
The 1040/1041 axles are what you call 1030/1031 axles when you put traction lock diffs in them. So except for the diff lock they are the same. If a 1041 won't work neither will a 1031.
Rick
Re: Rear end transplant question[ALL/1988] posted by Peter on
Monday, 23 February 1998, at 4:17 p.m.
Thanks. This brings up another question(s)...
You're using the term axle when I think you mean to describe the whole rear end assembly, yes? Hence my question: Is the 1030 housing the same as the 1031 housing? Is it just the axles and differential that are different, or is the housing different as well?
Re: Rear end transplant question[ALL/1988] posted by Rick Ewald on
Wednesday, 25 February 1998, at 9:05 p.m.
Peter,
Yes when I refer to 1030/1031 (1040/1041) that refers to the internal components as well as the housing. The difference is the pinnion is a much larger diamater on a 1031 as it is designed for higher power applications.
Bearings are also larger.
I have seen V-8 conversions with engines up to 400 small blocks that use the original 1031 axle with no problem.
However if you are going to really go for the HP and you want the absoulute bullet proof set up I would consider giong to somebody like Stock Car Products and ordering a Ford 9" diff. They will build it to your ratio and width, you would have to weld on all the brackets off the factory axle. Then you will have to have the axle straightened (welding on the brackets warps the axle).
Then it will just be a matter of bolting it up.
This route will be seriously expensive, and will require fabracation skills (your or purchased).
any more questions?
Rick
Re: Rear end transplant question[ALL/1988] posted by Peter on
Thursday, 26 February 1998, at 9:21 a.m.
I've considered going to a fabbed Ford rear end, but want to exhaust the Volvo possibilities first. I've even thought about using the Winters quick change out of my race car... THAT would be cool!
If you've seen 1031 equipped cars with high HP V-8s, I'm curious as to what those cars had for diffs. Any idea?
Re: Rear end transplant question[ALL/1988] posted by Rick Ewald on
Thursday, 26 February 1998, at 11:48 p.m.
Peter,
All of the conversions had 1031 axles with open diffs in them. They seem to hold up well, but if you were to build a killer motor??? How crazy do you intend to get in the engine room?
Re: Rear end transplant question[ALL/1988] posted by Peter on
Friday, 27 February 1998, at 11:13 a.m.
Well, my motor will be fairly stout - about 350HP and 380 FT/LBS. But...
The reason I want a limited slip is not to make the rear end live under the power, but to get the power to the ground. It's hard to accelerate out of a corner when the inside rear tire's going up in smoke!
Re: Rear end transplant question[ALL/1988] posted by Topi on
Sunday, 22 February 1998, at 4:11 p.m.
Peter, how's V8 conversion coming along? Running yet? About your rearend: In Sweden they use 240 and early (up to '88) 700 rearends on 940s. Dana M30 gears & LSD will fit to them. I don't know how much work it's to mount, I've never seen under a 940. How about a T-bird rearend? It's got the same bolt pattern and it's all Ford then.
Re: Rear end transplant question[ALL/1988] posted by Peter on
Monday, 23 February 1998, at 4:26 p.m.
Howdy. The car's not running yet. It took forever to find the right pieces. But using the standard engine-conversion formula of "real time = 2 x fantasy time", I'm right on schedule. The engine's going together now, a new T5Z is sitting on my garage floor and the suspension and brake parts are on the car. The motor mounts have taken a full six weeks longer than they were supposed to... sigh.
Do the 240s come with both 1030 and 1031 rear ends in them, or just the 1030? I have thought about putting a Ford rear end in the car and will likely do that if I can't get the Volvo rear end figured out. Mounting the Ford will not be cheap, however.
Re: Rear end transplant question[ALL/1988] posted by Topi on
Monday, 23 February 1998, at 6:48 p.m.
I think 1031 is the same size as 1030. 164 had 1031 first, like 1974/5. I think you can bolt-on Dana 30 LSD to 1031, too.The only difference is bigger pinion shaft & bearing. I don't know if bearing OD is the same or bigger.Yes - 240 '89 - up suppose to be 1031s. Call Stefansson 011-46-303-944 30 (they're 9 h ahead of PST). They race 940s and know what to do!