JB_BA Posted October 4, 2003 Share Posted October 4, 2003 Yup... finally got the car running, and drove it to Reynolds tonight. My first run I was lined up with a buddy of mine and stagged to about 2 grand or so, and dumped the clutch. It was my first time having this car at the track, so I was going to try first gear at 2 grand and go from there. As soon as I launched, of course the tire started spining...then...pop...bogged in first, shifted to second, still no good...tried third then hit the breaks. The R200 lost a few teeth ...not totally a bad thing if I just say I had too much torque for my diff... I managed to drive the car back to Americus, and a block from the house the diff totally went out. (Sounded like popcorn back there...) So...now I have to find another differintial. Anyone got one they can recommend that would bolt up in place of the R200 I had? (It was someone in this forum's R200...but I can't remember whos it was...) I'd really like to go posi...but if that's a possible bolt in replacement then I just need something that'll hold up to 350 - 400 fpt... Thanks, JB Quote Link to comment Share on other sites More sharing options...
80LS1T Posted October 4, 2003 Share Posted October 4, 2003 The R200 should hold 350-400 easy. Maybe the one you had was ready to go? I think you should find another R200 and see what happens. Otherwise I think you are looking at a R230 swap. Guy Quote Link to comment Share on other sites More sharing options...
Guest zfan Posted October 4, 2003 Share Posted October 4, 2003 You sure it is a r200 rear end? Usually they are stout, mine is holding up after two years of abuse and I run a 350 with 300 plus to the rear wheels. I would try another one, the one you had may have just been ready to go. If you drive a manual that is harder on the rear as well. Mike Quote Link to comment Share on other sites More sharing options...
Mike C Posted October 4, 2003 Share Posted October 4, 2003 That car came from San Antonio, correct? I sold the guy the R200 after he had broken a couple of R180 diffs. That particular R200 came from a low mileage 78 280. It looked brand spankin' new inside, showing zero wear on gears. I think the car showed 80k on the odometer. If I would hazard a guess, your car has serious geometry issues with the rear suspension, otherwise there wouldn't be such a chain of broken diffs follwing that car. OR it wheel hops and you don't get out of it, loading and unloading the ring & pinion excessively. Also, nothing tears up an open diff faster than a one-wheel-peel either. The spinning of the drive wheel faster than the drivers side wheel causes the spider gears to spin like no tomorrow usually inducing a failure. Broken spider gear teeth can then wedge themselves in between the ring & pinion forcing a failure there. Nothing else just "bolts" in except another R200. Sounds like you need to look for an LSD equpped one and check out Pete's site for solving geometry and driveshaft issues you may have. Quote Link to comment Share on other sites More sharing options...
BRAD D Posted October 4, 2003 Share Posted October 4, 2003 An R200 LSD should be fine, it is the half shafts that will blow out. I hope my ZXT CV's are up for the times I want to pull They have been good for some 1.7 60 footers so far... Quote Link to comment Share on other sites More sharing options...
grumpyvette Posted October 4, 2003 Share Posted October 4, 2003 you might want to look this over http://www.turbobuicks.com/members/scottiegnz/vette-irs-swap.htm and think about a dana 44 Quote Link to comment Share on other sites More sharing options...
Guest bang847 Posted October 4, 2003 Share Posted October 4, 2003 i believe the overboost store has the r200 lsd for $750 new? but yeah that is a hefty price.. Quote Link to comment Share on other sites More sharing options...
80LS1T Posted October 4, 2003 Share Posted October 4, 2003 Well if your going to spend $750 on an LSD you might as well spend the extra $250 and pay for a Quafie! Guy Quote Link to comment Share on other sites More sharing options...
Guest ZmeFly Posted October 4, 2003 Share Posted October 4, 2003 for about 350 to 500 dollars, or you could spend the extra cash and get a quaife, lifetime gaurantee even under racing conditions, now thats a good gaurentee. they do cost mind you but to me they are worth it and they can handle the abuse Quote Link to comment Share on other sites More sharing options...
Mike C Posted October 4, 2003 Share Posted October 4, 2003 Reider Racing has the precision gear 12mm R200 LSD for $550. I bought one. It is a nice looking piece. I have not installed it yet, but I got an 12mm 3.54 R200 from an 85 300ZX turbo. Just need to find the time... Quote Link to comment Share on other sites More sharing options...
JB_BA Posted October 5, 2003 Author Share Posted October 5, 2003 Upon further examination this morning, I noticed the left wheel's half shaft dangling around under there, apparently that's what I heard snap. After driving back from Reynolds, as I stopped at the last stop sign of the drive, I put the car in first and eased down. *Pop Pop Pop pop pop*... Tried second, and got the same thing. All the gears were doing it. I'm guessing the teeth in the chunk finally all gave way, and the first pop at the track was the first few teeth and the half shaft snapping? I'm thinking another good R200 and perhaps some custom half shafts? What exactly is involved in swapping to positive traction? How much would it cost (estimated) to do a posi swap? Weren't there positive traction 300TTs? This is my first hot rod, and I just completed my first motor swap (the car drove great, by the way, stayed at 160 degrees the whole way to Reynolds...) but I've never done any work on a rear end. I've never even had the opportunity to WATCH someone do rear end work. I'll have alot of help with this around here, so if you guys give me some info and I'm having trouble putting it together to decide on the best option @ my budget, I'll just print it out... Thanks, JB Quote Link to comment Share on other sites More sharing options...
80LS1T Posted October 5, 2003 Share Posted October 5, 2003 Are you sure it wasnt just a halfshaft? That should have gave before the R200 did? Guy Quote Link to comment Share on other sites More sharing options...
stony Posted October 5, 2003 Share Posted October 5, 2003 You saw your halfshaft dangling????? and you made it home???? I have s nismo r-200 LSD. new case all new internals with about 300 miles on it. 600 plus shipping. 4.88 gearing Quote Link to comment Share on other sites More sharing options...
JB_BA Posted October 6, 2003 Author Share Posted October 6, 2003 Maybe it was the half shaft that broke when I was almost home then? JB Quote Link to comment Share on other sites More sharing options...
Phantom Posted October 6, 2003 Share Posted October 6, 2003 I'm currently running the 87-89 3.70:1 R200 LSD unit through Spicer "brute Force" universal equipped half-shafts. I made two runs on the LSD and the original stock half-shafts and then "hospitalized" the car for some other work. While undergoing surgery I've had the Spicers installed. The car is running an LS1/T56 combination with 311 RWHP & 326 RWTQ. I don't know how that compares to your set-up but I haven't broken anything. Quote Link to comment Share on other sites More sharing options...
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