Lostcause521 Posted December 3, 2013 Report Share Posted December 3, 2013 I pulled a 4speed tranny out of a early 620 this weekend and I need some tips on assessing if it's good. The input shaft splines are smooth and strait, the input shaft doesn't wiggle side to side, I can feel a change in resistance spinning the output shaft when I change gears so I am assuming it engages each gear and spins smoothly in each gear, and the output shaft splines are smooth and strait. It also turns the speedo cable. Is there anything else I can check from the outside and is there anything I can check by removing the pan and peaking inside? Thanks. 1 Quote Link to comment
Eagle_Adam Posted December 3, 2013 Report Share Posted December 3, 2013 those are all good checks the only other one i normally do is fluid color and to see if there's any metal on the drain plug magnet Quote Link to comment
izzo Posted December 3, 2013 Report Share Posted December 3, 2013 What Adam just said. in my years of datsuning, i haven't seen a bad four speed. Def check the fluid, tho. Make sure its OK and not all watery and rusty up in there. 1 Quote Link to comment
banzai510(hainz) Posted December 3, 2013 Report Share Posted December 3, 2013 i haven't seen a bad four speed I have kinda Syncros bad. I cahnge 1 for bad 2 to 3 then installed a bad 3 to 4th Quote Link to comment
Lee R Posted December 3, 2013 Report Share Posted December 3, 2013 i haven't seen a bad four speed I have kinda Syncros bad. I cahnge 1 for bad 2 to 3 then installed a bad 3 to 4th English please Mr. Hainz. :poke: J/K Quote Link to comment
ggzilla Posted December 3, 2013 Report Share Posted December 3, 2013 All the previous responses are right on. Synchros are the most likely to be bad and unfortunately there isn't a way to check them as far as I know without driving it or partially disassembling the transmission. Quote Link to comment
DAT510 Posted December 3, 2013 Report Share Posted December 3, 2013 Worry not, dissassembling a Tranny is easy and adds peace of mind (if you know what to look for). All you need to reassemble is one bearing cover gasket and sealant. I took my 5SPD apart because it sat in the rain for months, looked brand new inside. Just make sure when you put it together you don't get any grinds or noises, I had to take mine apart a couple times to realign everything. Quote Link to comment
datzenmike Posted December 3, 2013 Report Share Posted December 3, 2013 I pulled a 4speed tranny out of a early 620 this weekend and I need some tips on assessing if it's good. . Early 4 speed is this... ...so pull the bottom off and take a look. Best if never been drained so you can look at the oil. It should be changed about every 25K-30K miles so who ever does that? Maybe the original owner but after that the 4th or 5th don't know or car they just drive them. So if the oil come out clear and golden that's good. I think the drain bung may be magnetic on these... they are on the later 71B 4 speeds. Expect to see a black paste of metal filings but free of chunks and ball bearing parts. Wipe clean so that the next time it's removed it will show what has been added. You can turn the input in all gears and feel the output turn to confirm that there is a connection when in gear. As stated the best evaluation is to drive it. Bearings and synchros may look ok but still growl or not shift properly. If installing, be sure to replace the output seal, they are less than $5. Put grease on the lips so it doesn't tear or start up dry. . Quote Link to comment
Lostcause521 Posted December 4, 2013 Author Report Share Posted December 4, 2013 I'm sure it needs a new output shaft seal, there was a significant amount of grime at rear of the transmission on the vehicle. When I pull off the pan, will damage look as obvious as chipped gear teeth, or much more subtle than that? Also, what should I use to clean the inside of the pan and the bell housing, mineral spirits? Quote Link to comment
ggzilla Posted December 4, 2013 Report Share Posted December 4, 2013 I use Carb cleaner or starting fluid. Quote Link to comment
Eagle_Adam Posted December 4, 2013 Report Share Posted December 4, 2013 clean it with something that evaporates, like ggzilla said, brake fluid/starting fluid/carb cleaner damage can be seen for the most part Quote Link to comment
Lostcause521 Posted December 4, 2013 Author Report Share Posted December 4, 2013 Well, the first bad sign: I pulled the bottom drain plug, flipped it over, and... nothing came out. Nada. So thats where all that grease came from... :crying: Quote Link to comment
Eagle_Adam Posted December 4, 2013 Report Share Posted December 4, 2013 was there a magnet in the drain plug? Quote Link to comment
Lostcause521 Posted December 4, 2013 Author Report Share Posted December 4, 2013 Not as far as I can tell. I didn't see any filings stuck to the end of the piug. Quote Link to comment
datzenmike Posted December 4, 2013 Report Share Posted December 4, 2013 Oil at the front could be a bad engine rear seal too. Empty transmission could have been drained previously, unless you know for sure. If the front seal was bad it's possible this was run dry. Quote Link to comment
dr.feltersnatch Posted December 4, 2013 Report Share Posted December 4, 2013 they probably drain them before putting in the yard Quote Link to comment
Eagle_Adam Posted December 4, 2013 Report Share Posted December 4, 2013 look at the metal in the trans, and discoloring from heat? Quote Link to comment
datzenmike Posted December 4, 2013 Report Share Posted December 4, 2013 I pulled a 4speed tranny out of a early 620 this weekend and I need some tips on assessing if it's good. . Well was it at home or the wreckers? Need more info. Quote Link to comment
Lostcause521 Posted December 4, 2013 Author Report Share Posted December 4, 2013 It was at a Pick A Part, so yea they probably drained it before they put it in the yard. i want to degrease the rest of the tranny before I pull the pan off, I will look for signs of heat damage as well as general wear. Oil at the front could be a bad engine rear seal too The clutch and flywheel were clean as a whistle, but the dust boot around the clutch fork was gone, and the inside of the bell housing is fairly greasy. Most of the grime is around the pan and the rear of the tranny. 1 Quote Link to comment
Lostcause521 Posted December 7, 2013 Author Report Share Posted December 7, 2013 Update: I pulled the pan and I can't see any visible signs of wear, no discoloring, chipped teeth, ext, just fine metal flakes on the magnet. Quote Link to comment
datzenmike Posted December 8, 2013 Report Share Posted December 8, 2013 Shift the gears and turn the input. The F4W63 is a fairly rugged transmission and a variant was also used on the L20B and Z20 motor. Been around for at least 16 years. Quote Link to comment
Eagle_Adam Posted December 9, 2013 Report Share Posted December 9, 2013 winning! hopefully you didn't get a dud! Quote Link to comment
datzenmike Posted December 10, 2013 Report Share Posted December 10, 2013 http://www.the510realm.com/viewtopic.php?f=10&t=26369&sid=7ee239f9727fe2111787db0bf245e7a3 A 510 4 speed can be made to work in a 521 with little to no work. It.s the correct length but a close ratio compared to the stock 4 speed. Quote Link to comment
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