volkswagner Posted May 21, 2017 Report Share Posted May 21, 2017 I have two transmissions that I am trying to swap the bell housings on. They have different size counter shaft bearings. The donor has a 62mm O.D. bearing. I would like to pull that off and put on a new bearing to match the bell housing I need which has a 56mm O.D. bearing. The problem is I don't know what the car the 56mm transmission came from and I cannot for the life of me find a car on rock auto which shows this size bearing. Lots of other common sizes, just not 56mm (2.20in) Anyone know the year break down of bearing sizes. Quote Link to comment
Crashtd420 Posted May 21, 2017 Report Share Posted May 21, 2017 Is that a 71b series transmission?... if mike doesnt chim in i think I have the part number.... you need the 56mm right? Quote Link to comment
Crashtd420 Posted May 21, 2017 Report Share Posted May 21, 2017 So i can only assume your doing the same swap... l series bellhousing on a 71b transmission... this is what datzenmike said I needed.... Quote Link to comment
Crashtd420 Posted May 21, 2017 Report Share Posted May 21, 2017 I was also told to use the shims and front plate that go with the l series bellhousing... Quote Link to comment
datzenmike Posted May 21, 2017 Report Share Posted May 21, 2017 The 71-B changed from the 56mm to the 62mm counter shaft bearing after '84. The 71-B was retired in '86.5. This narrows the ID to a 720 gas or diesel engine or the '85-'86.5 S12 with CA20 or CA18ET. If swapping an L series 71-B front case, just pull the 62mm off and hammer a 56mm on. I would advise a NEW 56mm bearing as they do take a beating and one of the reasons for switching to the larger 62mm bearing. Use the 71-B cover plate. As for shims, you should really make some measurements while the cover plate is off. The counter bearing will stick out very slightly from the front of the transmission case. Measure this amount (how much it sticks out) and select shims that are just slightly thinner. (about 0.010" thinner) This allows the cover plate to just barely push against the counter shaft bearing and support it. Too tight is not good and too loose will allow the counter shaft to move forward and back. It's possible that the first/second shift rod is a larger diameter (16mm) than the hole in the 71-B case. Just drill it out. Quote Link to comment
Stoffregen Motorsports Posted May 21, 2017 Report Share Posted May 21, 2017 Deleting the gasket behind the cover plate is a trick used to tighten things up. You need to test fit it this way before final assembly to make sure the bearings don't get too tight. The main benefit behind this mod is a shortening of the shift throws, or more accurately, a more positive stop of the shift throws. It's an old racing mod to keep the shift collar from getting jammed on the gear during hard shifts. If you don't want to delete the gasket, but do want to shorten the shift stops, you can weld a bump into the cavity where the shift rods contact and grind the bump to fit. You'll hear a slight clunk in the cover when the rods hit. Don't overdo it, or it will pop out of gear. 1 Quote Link to comment
wayno Posted May 21, 2017 Report Share Posted May 21, 2017 I go to a place that sells bearings with my old bearing and ask for the best money can buy, they tell me that is Japanese, not Korean, not Taiwan(China), not the USA. 1 Quote Link to comment
datzenmike Posted May 21, 2017 Report Share Posted May 21, 2017 I'm looking at a new in the box 56mm Nachi bearing made in Japan. Quote Link to comment
shacks510 Posted May 21, 2017 Report Share Posted May 21, 2017 If you don't use a gasket on the front cover, put a flat washer on the lower right bolt (4:30 or so) to take up some of the bolt length, or the bolt will bottom out on the countershaft gear and lock it up. Quote Link to comment
datzenmike Posted May 21, 2017 Report Share Posted May 21, 2017 I don't think the gasket is available anymore. 1 Quote Link to comment
volkswagner Posted May 22, 2017 Author Report Share Posted May 22, 2017 Damn you guys are good. Yes it is the 56mm bearing shown in Crash's diagram. Even looking at the cars specified by DatzenMike, all of the listings either have no bearing O.D. shown or have an O.D. of 2.44 or 1.85.I think I'll just go the Wayno route and measure it up and order to fit. Quote Link to comment
Crashtd420 Posted May 22, 2017 Report Share Posted May 22, 2017 Try this list if you want to verify.... it's an eBay listing..... 20 + 5.... could even call them..... Quote Link to comment
datzenmike Posted May 22, 2017 Report Share Posted May 22, 2017 71B counter bearing 32219-E9000... 56mm used till about Sept '84 on the 720 and May in the S112 32219-V5201... 62mm used from Oct. '84 on the 720 and June '84 on in the S12 (also used on the '84 Maxima for the last production month) 71C counter bearing 32219-V5201.... 62mm used on the '86.5 and up 4 cylinder D21 Hardbody, '87 4 cylinder Pathfinder '84-'89 non turbo Z31 300zx but not the Z32 Vanette. 240sx Quote Link to comment
Stoffregen Motorsports Posted May 22, 2017 Report Share Posted May 22, 2017 Just to be clear, the "shim" inside the front cover is more of a thrust washer than it is a shim. That's all. 1 Quote Link to comment
datzenmike Posted May 22, 2017 Report Share Posted May 22, 2017 Yes it pre-loads the bearing. If the bearing sits 0.100" out from the case, the selected shims from a chart, around it should total 0.090". This allows the cover plate to press against the bearing by 0.010". Quote Link to comment
Crashtd420 Posted May 22, 2017 Report Share Posted May 22, 2017 That's good info for me too, when I finally swap mine.... thanks... Quote Link to comment
Stoffregen Motorsports Posted May 23, 2017 Report Share Posted May 23, 2017 I guess I should chose my words more carefully. I should have said that if you leave the washer out of the assembly, the bearing can dig into the front cover. Probably from harmonic vibration. I've seen it happen before, on both the aluminum covers and on the cast iron covers. The washer helps protect the cover from such wear. Quote Link to comment
shacks510 Posted May 24, 2017 Report Share Posted May 24, 2017 I don't think the gasket is available anymore. Front cover gasket? The kits come with a rather thick cork gasket. 71C gaskets are still available from Nissan. I just sealed mine with RTV (not orange) and left the shim out because it prevented the cover from sitting flat. Quote Link to comment
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