Need Advise Members !!!!
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Need Advise Members !!!!
I know there has been threads regarding the lsd and rear end swaps so I will keep this simple. I searched the archives, faq and current threads for the past 1 1/2 hours and have somewhat of an idea on what to do. I swapped the pumpkin from my 84 se in to my 84 gs and kept the same axles for the bolt pattern. I know of the disc and susp. upgrades but am not concerned of this. I took the rex out and put 125 miles on her before I heard the thumping in the rear end. I have an 83 gsl out back and need to know if I am right on this. I will need to change the driveshaft ( or flange on the pumpkin ) and switch the complete housing and all due to the difference in axle size correct ? Which also means I will need the brake lines as well. Or should I find ( where ) the parts to rebuild the lsd pumpkin from the se. Gear ratio difference is very minimal so not too concerned about that. I ask this cuz I have put about $2500.00 into her this last month and really can not afford a whole lot more, however I want to drive her sooooo bad. Also, in Michigan the 7 is increasingly difficult to locate parts, new or used. Thanks in advance guys, any advice would be very helpful.
Jim
Jim
#3
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If you switch to the 83 rear end, use all of it. It may or may not have the large pinion flange. If you have the 83 driveshaft, don't worry about it, use that one. If you don't have the 83 shaft and the do have the small pinion flange, change in the larger one to match the S3 driveshaft.
Brake lines will mount up woth no moddifications at all.
You might want to explain the noise you heard a little better before you start switching rear ends. Depending on what it is, the switch may not be needed.
Brake lines will mount up woth no moddifications at all.
You might want to explain the noise you heard a little better before you start switching rear ends. Depending on what it is, the switch may not be needed.
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The noise is a real low thud thud. It is steady and coincides with the revs of the drivetrain at a coast or with the clutch pushed in. When it is under load such as braking or acceleration it disappears. It started out really low and had become progresively louder as I drove it home. About 15 -20 miles. If I remember right last year it made the same noise and I was not careful with it and next thing I knew I had busted the teeth on the other dif. I almost think it may just be bearing noise but if neglected it will become a complete rebuild. I do not know how long the SE sat before I bought it and then it sat another year or two and my thinking is that maybe the bearing was bad but had enough gunk to keep it good for the first 125 miles. Once the new fluid ( amsoil ) worked through and cleaned it out it showed up. I am pretty sure it is not lsd chatter since amsoil has the additive in it.
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Driveshaft does not have interchangeable u-joints correct. At least I know I read that somewhere in the mazda books. Maybe it was for earlier versions. If it was a u-joint I would feel a vibration either on take-off (rear) or slow down(front) and I am not, it is very smooth.
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One more tidbit. I called a garage this morning that specializes in difs and they said they would have to split it to determine if it was a bearing. Cost about 150 -185 for a total rebuild. I also have an in at the Mazda dealer so I can get parts for cost and they( garage ) were willing to give me a list of what would be needed. If it is only a bearing, I should not have to replace the ring and pinion or the spider gears right ?
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#8
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where in michigan are you located? I highly doubt that a bearing would go seemingly instantly from quiet to a thud-thud-thud. I think my bearings are starting to go in my rear end, i have an '82 GS, and i have a thrumming noise coming from my rear end. Sounds like a worn out bearing to me. I agree with trochoid that it could be your driveshaft. Before you go about ripping out driveshafts and your rear end, have you checked your tires? If you slipped or broke a belt while driving, it makes that kind of noise and will get progressively worse. Swap your rear tires to the front and front to the rears and see if that helps out at all.
#9
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If it is only the wheel bearings, the rest may be good. If one bearing needs replacement, do both, it's cheaper in the long run.
Edit.
Now that I think about it, I remember in high school a friend of mine kept blowing the r&p on his 59 Impala. Missing one tooth makes a definite thud-thud. Just hope for the best.
A good driveline shop can remove the u-joints and replace them with replaceable and greasable joints.
Edit.
Now that I think about it, I remember in high school a friend of mine kept blowing the r&p on his 59 Impala. Missing one tooth makes a definite thud-thud. Just hope for the best.
A good driveline shop can remove the u-joints and replace them with replaceable and greasable joints.
Last edited by trochoid; 04-01-06 at 05:10 PM.
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Originally Posted by whitey85mtu
where in michigan are you located? I highly doubt that a bearing would go seemingly instantly from quiet to a thud-thud-thud. I think my bearings are starting to go in my rear end, i have an '82 GS, and i have a thrumming noise coming from my rear end. Sounds like a worn out bearing to me. I agree with trochoid that it could be your driveshaft. Before you go about ripping out driveshafts and your rear end, have you checked your tires? If you slipped or broke a belt while driving, it makes that kind of noise and will get progressively worse. Swap your rear tires to the front and front to the rears and see if that helps out at all.
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Originally Posted by trochoid
If it is only the wheel bearings, the rest may be good. If one bearing needs replacement, do both, it's cheaper in the long run.
Edit.
Now that I think about it, I remember in high school a friend of mine kept blowing the r&p on his 59 Impala. Missing one tooth makes a definite thud-thud. Just hope for the best.
A good driveline shop can remove the u-joints and replace them with replaceable and greasable joints.
Edit.
Now that I think about it, I remember in high school a friend of mine kept blowing the r&p on his 59 Impala. Missing one tooth makes a definite thud-thud. Just hope for the best.
A good driveline shop can remove the u-joints and replace them with replaceable and greasable joints.
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Holland eh? I'll be putting together the Grand Rapids meet again in a month or two. Hope to see you there. Check 6-mile autoparts (just North of GR) for parts, they have a few 7s up there and pretty good prices.
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No the height is the standard Eibach lowering springs. The Epsilons wheels and 15" tires do raise it a bit, probably near stock height, but it can't go much lower than it is now because of the front air dam. I tore that up the first time I pulled in the driveway. The fenders also give the illusion of more height.
Thanks for the compliment.
Spiders usually clunk more on turns. When going in a straight line, they are all turning at the same rate.
Thanks for the compliment.
Spiders usually clunk more on turns. When going in a straight line, they are all turning at the same rate.
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Originally Posted by Kentetsu
Holland eh? I'll be putting together the Grand Rapids meet again in a month or two. Hope to see you there. Check 6-mile autoparts (just North of GR) for parts, they have a few 7s up there and pretty good prices.
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Originally Posted by trochoid
No the height is the standard Eibach lowering springs. The Epsilons wheels and 15" tires do raise it a bit, probably near stock height, but it can't go much lower than it is now because of the front air dam. I tore that up the first time I pulled in the driveway. The fenders also give the illusion of more height.
Thanks for the compliment.
Spiders usually clunk more on turns. When going in a straight line, they are all turning at the same rate.
Thanks for the compliment.
Spiders usually clunk more on turns. When going in a straight line, they are all turning at the same rate.
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I am a big giant dumbass!!!!!!!!! I figured out the noise in my rear end after I changed the driveshaft, took it for a ride and still heard it, put it up on jackstands, still heard it but only from the driver side, grabbed the lugwrench to pull the wheel and noticed 3 of the 4 lugs loose. Tightened em down and low and behold, the noise disappeared. If you could seem the shame on my face you all would be laughing. At least I know I have 2 ggod driveshafts now ...lol
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Good thing since I was up at 110 mph down the stretch of road by my house when the noise showed up. I have a nice section of road that is dead straight for about 2 1/2 miles in the country, perfect for getting the 7 up to speed. Got on it a little harder today and wow do I love the lsd. Also did the mechanical secondary trick but not too sure how I like it. Definetely quicker in the mid rpms though, just have to get used to a little lighter pressure pedal. Put another 100 miles on it today. A few donuts in the parking lots and some intersections. Why would anyone want to drive anything else. Tomorrow I will really be getting on it to test the handling and takeoff, clutch is pretty much broke in now.
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That was the case yesterday...rained a little in the afternoon and wet the pavement nice. Every stop and go and turn was a blast. And with the new centerforce clutch she grabs hard in 3rd, even got a little sideways once. Today sucks though, forecast for rain most of the day and then possible snow. UGH....some times I really don't llike Michigan. By the way, I really would like to thank you for the all your insight and help the past couple of days, much appreciated.
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Originally Posted by trochoid
Most welcome. Just be careful enjoying the clutch and lsd, don't need new pics in the wercked 1st gen thread.
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Originally Posted by Kentetsu
Glad you figured it out man. Also nice to hear that not all of the 7s in Michigan are rotting out. Take good care of it!
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