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Unread 02-02-2010, 06:33 AM   #16
Mike Romain
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The syncros will go bad fast if you use the wrong grade of gear oil in it. The modern stuff on the shelves is a GL5 rated oil, the old syncros need a GL3 or GL4 gear oil or the syncros start to fail.

Simply changing to the correct gear oil usually fixes them 'if' this is the issue. Napa sells the proper gear oil, SAE 85w90 Gear Oil GL4 (also meets GL3), Part # SL24239.

You could also just be low on fluid.

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86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
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Unread 02-02-2010, 11:55 AM   #17
mastercraftka
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I have thought of that but it has been raining here for days and have not had a chance to get under it. I am definately going to try this before I start tearing it apart. Thanks,
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Unread 02-02-2010, 11:58 AM   #18
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Yes it is an 86 cj7 four speed. T18? I will also check the shift fork and rails. Been horrible weather here and have not place under cover to work on it. South Texas and didn't get out of the 30's two days in a row, and now we are stuck in the 40's can't believe this weather.
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Unread 02-02-2010, 12:04 PM   #19
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I mean an 84 cj7 sorry.
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Unread 02-02-2010, 12:11 PM   #20
Mike Romain
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Originally Posted by mastercraftka View Post
Yes it is an 86 (84) cj7 four speed. T18?
Straight gear shift or bent shifter? The bent shifter one will be a T4 I think.
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86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
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Unread 02-02-2010, 12:14 PM   #21
mastercraftka
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bent shifter.
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Unread 02-06-2010, 06:11 PM   #22
mastercraftka
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Well the weather finally cooperated and I check the transmission fluid and it was about a quart low and it is still hard to shift between 1st and 2nd and pops out of 1st. I geuss the worst is upon me, time to take it apart? Anything else i could try? or is it the synchronizer?
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Unread 02-06-2010, 06:26 PM   #23
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A T4 is nothing like a T150, T18, or any other old school Trans, A T4 and T5 are a splitcase, a hole world of deference. I have rebuilt a lot of T90s and T18s over the years but when it came to my T5 I sent it out for rebuild.
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Unread 02-06-2010, 07:32 PM   #24
mastercraftka
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so i hear you say send it off? what will it run me you think? Dollars that is?
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Unread 02-07-2010, 06:33 AM   #25
cw4stein
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You may want to check but you could likely have a SR4. If it has the stock transmission, it's definitely not a T-150 (3 speed) or a T-18. The SR4 is notoriously weak and will not stand up to any heavy usage. The PO of my jeep left a SR4 behind a SBC swap and I killed it just driving it back to AL from Round Rock, TX. I picked up a T-18 from Pull-A-Part for $54, and ordered a rebuild kit and adapter from Novak to keep the D300. Got lucky...Tore down the T-18 and returned the rebuild kit because it was in fantastic shape! Depending on the cost of your repair, you may want to look at the cost of a swap now as opposed to recurring tranny issues ($). There are many swap options; search this forum for recommendations.
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Unread 02-07-2010, 06:42 AM   #26
Mike Romain
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Quote:
Originally Posted by mastercraftka View Post
Well the weather finally cooperated and I check the transmission fluid and it was about a quart low and it is still hard to shift between 1st and 2nd and pops out of 1st. I geuss the worst is upon me, time to take it apart? Anything else i could try? or is it the synchronizer?
I would do a fluid change just in case it only has the wrong stuff in there before tearing into it. They can really act up when the wrong fluid causes the syncros to bind up.
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86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
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Unread 02-08-2010, 12:53 PM   #27
mastercraftka
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ok i will drain it first. It is a four speed but i have no idea what tranny that is i assume it is a stock transmission. I do have a old transmission off of an 87 wrangler but not sure if that will work on the 84 cj7.
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Unread 02-09-2010, 02:52 PM   #28
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Does anyone have a picture of what the synchronizer looks like from the shifter plate view?
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Unread 02-10-2010, 07:16 AM   #29
Mike Romain
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Originally Posted by mastercraftka View Post
ok i will drain it first. It is a four speed but i have no idea what tranny that is i assume it is a stock transmission. I do have a old transmission off of an 87 wrangler but not sure if that will work on the 84 cj7.
If I remember right, as mentioned, a bent shifter means a T4 and a straight shifter means an SR4.

The wrangler tranny is a Peugeot like the late 80's XJ I think and is worse than anything they put in a CJ. It needs a different pilot bushing, a pilot bearing for one.

The syncros are thin brass gears.
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86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
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Unread 02-10-2010, 08:23 AM   #30
mastercraftka
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I figured so but i know i have robbed lots of steering parts and springs off of it that are identical and i know the engine was a 4.o i think. Anyway I was just thinking. I still haven't had a chance to drain all the fluids yet but that is my next step before i rip it out.
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