Chance Posted February 23 Report Share Posted February 23 are the front input shafts seals and the rear output shaft seals the same across the F4W63 (73' and before) and the F4W71B (74' and up) Thanks! Quote Link to comment
datzenmike Posted February 23 Report Share Posted February 23 The F4W63 and the F4W71B rear seals are the same 32136-U0100 The F4W63 front seal is 32113-N2101* The F4W71B front seal is 43114-Y4000 *The front seal on the FS5W63A 5 speed from the '77-'79 S10 200sx also uses this seal. Quote Link to comment
Chance Posted February 23 Author Report Share Posted February 23 Thanks @datzenmike do you know where I can find an oem front seal for the F4W63? can't find anything for this transmission. i've tried the Nissan dealer but they don't have anything and since the rear seals are the same I'll just get an oem one that says its for the F4W71B. Quote Link to comment
datzenmike Posted February 23 Report Share Posted February 23 The rear seals are the same. The front seal was last used in the '79-'81 A10 or HL510 in it's 4 or 5 speed. You should be able to find these at auto parts stores. Like NAPA or Lordco etc. Quote Link to comment
Chance Posted February 23 Author Report Share Posted February 23 @datzenmike may be a dumb question but I just put the part number in NAPA for both the front and rear seals and they are the same size and everything. if that's the case could I just buy two of the rear seal I get and use it for the front? Quote Link to comment
mklotz70 Posted February 23 Report Share Posted February 23 You can do a parts search on rockauto. They both come up. When it shows you an option, click on the info button and it will typically give you more info like dimensions. The factory number shows up in the list of alternate part numbers, but both numbers don't show up in either. The dimensions do not match. Quote Link to comment
Chance Posted February 23 Author Report Share Posted February 23 @mklotz70 I looked both the part #'s up for the front and rear and they come up as the same skf 13907 and same measurements with both oem part numbers. I highlighted both of them in yellow. Quote Link to comment
Crashtd420 Posted February 23 Report Share Posted February 23 21 minutes ago, Chance said: @mklotz70 I looked both the part #'s up for the front and rear and they come up as the same skf 13907 and same measurements with both oem part numbers. I highlighted both of them in yellow. It may be true but it would probably be best to measure the ones you have to compare first..... The listing are not always 100% correct.... Quote Link to comment
datzenmike Posted February 23 Report Share Posted February 23 The rear seals are the same part number. The front seals are not the same Nissan part number as the rears and the F4W63 front seal is NOT the same number as the F4W71B. 1 Quote Link to comment
Chance Posted February 23 Author Report Share Posted February 23 @Crashtd420 yea I agree, i just want to find the seals and have them with all the other parts ready for when I drop the transmission. so I can get it done quick. Quote Link to comment
Chance Posted February 24 Author Report Share Posted February 24 @datzenmike yea the part numbers are not the same but its weird all the aftermarket seals for both front and rear all have the same measurements. but after some research and looking at the oem seals it seems that the rear 32136-U0100 was replaced by 32136-U010A. that seal measuring at 35mm inner, 50mm outer, and 11mm width. which would be 1.378 in, 1.969in, and 0.433in. then the front seal 32113-N2101 is measuring 34mm inner, 50mm outer, and 7mm width. which is 1.339in, 1.969in, and 0.276in. while all the other other aftermarket seals front and back from rock auto, napa, etc. are measuring at 1.378in inner, 1.978in outer, and 0.276in width. so that leaves me stuck what fits the front? the aftermarket front seal inner is 1mm off and outer is off a tiny bit to. is it that tight of a tolerance to worry about those discrepancies? the rear is basically the same except off by 4mm on width does the width matter? Thanks. Quote Link to comment
datzenmike Posted February 24 Report Share Posted February 24 That's interesting because years ago I pried out a rear seal and the replacement was noticeably narrower. I commented that you could fit two in place. I wonder if the after market industry has decided to make the decision to use the narrower ones in the rear? I've had nothing put problems with synthetic oil drips in my transmission. I bet the wider ones are the cure. Quote Link to comment
Chance Posted February 24 Author Report Share Posted February 24 @datzenmike yea i'm thinking of just running 2 rear seals one for the front one for the back. the rear seal 32136-U0100 was replaced by 32136-U010A which is used by a ton of other cars it fits the 240SX S13 S14 w. SR20DET, KA24E and KA24DE 5 speed and the S15 w. SR20DE 5 speed. do you think the extra 4mm of width and 1mm of extra O.Diameter.on this rear seal would affect the front from sealing? Quote Link to comment
datzenmike Posted February 24 Report Share Posted February 24 Tough to say. Try it!!! Quote Link to comment
mklotz70 Posted February 24 Report Share Posted February 24 I must have gotten some numbers crossed. I was trying to show that RA was a good way to get part info. The National 1981 does say its for a '74 and up input shaft seal. ....and after looking them up again, I agree with you that it shows the same for input and output. I do know that when I had my NL, the output seal matched on every 4 and 5 spd tranny I had here.....even a D21 trans. Quote Link to comment
datzenmike Posted February 24 Report Share Posted February 24 It's probably being used today. VERY common output seal 71B and 71C , F4W63 after the 510 and FS5W63A dog legs in B-210/A10 S10. It should fit the 520/521 and 510 F4W63 transmissions but doesn't numbers match. Some time around '70/71 the F4W63 became the F4W63L. They look the same but maybe it was beefed up as it entered the '70s because of the increasing engine displacements L18/ L20B??? Quote Link to comment
Chance Posted February 25 Author Report Share Posted February 25 @datzenmikeunrelated to the trans seals but I had a question about the rear main seals. I saw on another post on here someone said that all the rear main seals are the same for all L series engine L16,L18,L20, etc. but when I look up the oem rear main seal it says its only down till the 75' 620 when they started to put the l20's in the 620. so is this true? in not do you know the oem part # for the 73 620. Thanks Quote Link to comment
datzenmike Posted February 25 Report Share Posted February 25 The L16/L18 rear seal is listed as 12279-A4600 The L20B rear oil seal is listed as 12279-R4601 Quote Link to comment
Chance Posted February 25 Author Report Share Posted February 25 (edited) @datzenmikethanks for the part numbers it seems part # 12279-2B500 is the replacement for both. so maybe they're all the same. Edited February 25 by Chance Quote Link to comment
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.