jacob80 Posted December 7, 2008 Share Posted December 7, 2008 Hey guys, we're working on putting an L28ET into our '73 240z and we thought while we have it out, we might as well take the transmission out and have the seals replaced and transmission looked over. I was just wondering how involved this is. My concern is that the flange bolts that connect the transmission to the driveshaft are going to be a pain in the ass. What are your guys' experience with this and how hard is it to break these bolts loose? Is there anything specific we should do with the transmission once we have it out? I am also going to be replacing the insulator. Thanks! Quote Link to comment Share on other sites More sharing options...
Flexicoker Posted December 7, 2008 Share Posted December 7, 2008 There are no bolts that connect the transmission to the driveshaft. It's a slip-yoke. You'll need to undo the 4 bolts that connect the driveshaft to the differential, not a big deal. Replace the seals in it, and put some Redline MT-90 in it when you're done. Quote Link to comment Share on other sites More sharing options...
jacob80 Posted December 7, 2008 Author Share Posted December 7, 2008 There are no bolts that connect the transmission to the driveshaft. It's a slip-yoke. You'll need to undo the 4 bolts that connect the driveshaft to the differential, not a big deal. Replace the seals in it, and put some Redline MT-90 in it when you're done. Are you saying we have to take out the drive shaft I order to take out the transmission? We wanted to just drop the transmission if possible. Also, how do you disconnect the the transmission at the slip yoke? Quote Link to comment Share on other sites More sharing options...
Flexicoker Posted December 7, 2008 Share Posted December 7, 2008 Ya, there are 4 bolts on the flange yoke at the differential. Just take them off, and the driveshaft will just pull out of the back of the transmission. Its easy, don't worry. You'll also need to remove the exhaust, the transmission mount, starter, shifter, clutch slave cylinder and all the bolts holding the bellhousing to the engine. Remove the transmission first, and make sure you have the back of the engine supported with something. It might take a few blows with a rubber mallet to get the transmission free from the engine, from there just pull it straight back about 6 inches until the input shaft is clear of the clutch and you're good to go. My Dad and I usually put a jack under the transmission to support the weight, and then we balance it on its way down. Its heavy. You can also remove the engine and the transmission at the same time if you prefer, which might be easier as long as you have the radiator and fan and everything in front out of the way, and an engine hoist with enough capacity and travel. To get to the front seal on the transmission, you have to remove the front-cover/throwout snout. Its 5 bolts, and if it doesn't come out easily you can thread a long bolt into the throwout arm pivot hole until it bottoms on the transmission and pushes the cover off. The seal is in there. There is also a shim for the layshaft bearing, so make sure you don't lose that. Quote Link to comment Share on other sites More sharing options...
jacob80 Posted December 8, 2008 Author Share Posted December 8, 2008 Then engine is out, so will I need to even unbolt the driveshaft from the differential? I should just be able to unbolt the transmission crossemember, slave cyliner, and tach wires from the transmission and pull it out through the front, correct?? Quote Link to comment Share on other sites More sharing options...
Flexicoker Posted December 8, 2008 Share Posted December 8, 2008 Yes, but there are no tach wires on the transmission, those are the reverse switch, and possibly a neutral switch too. The tach is driven by the coil. Quote Link to comment Share on other sites More sharing options...
blue72 Posted December 8, 2008 Share Posted December 8, 2008 Make sure you drain the transmission first. Otherwise the tail end will likely spill fluid when you pull the driveshaft out of its slip yoke and try to finagle it out through the engine bay. Quote Link to comment Share on other sites More sharing options...
jacob80 Posted December 18, 2008 Author Share Posted December 18, 2008 Ok so now I want to drop the driveshaft...how easy do the bolts and nut come off? There is snow on the ground so I don't want to be laying in it very long! Quote Link to comment Share on other sites More sharing options...
blue72 Posted December 18, 2008 Share Posted December 18, 2008 Just a wrench on both sides and a few minutes as long as they aren't rusted into one piece. If it's just a blob of solid rust it'd be anyone's guess as to what lengths you'll need to undertake to remove them. Quote Link to comment Share on other sites More sharing options...
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