Mickey Richaud Mickey Richaud Townsend TN (198 posts) Registered: 08/25/2015 06:36AM Main British Car: '03 Jaguar XK8 Jaguar 4.2 |
T5 5th Gear "Rattle"
Folks: I've read that T5's can be noisy, especially in 5th. The World Class T5 in my GT has had a rattle in 5th since I installed it. Consequently I had it rebuilt by Stan at Pro-Force Performance in Georgia (nice guy, and came recommended), as it had other issues; but it is still noisy in 5th under load under 50 mph, and sometimes in 4th around same rpm (though not nearly as loud). Once it gets up to speed it's quiet, but kinda bothersome otherwise. With the 3.9 rear end, I'm often at a speed where 4th gear the engine rpm runs a bit high for comfort/economy, and 5th gear too low (rattles).
I'm running Pennzoil Synchromesh fluid, per Stan's recommendation. Anything better out there, or is that the fluid of choice? Hope this makes sense! And thanks for any input. Mickey |
mgb260 Jim Nichols Sequim,WA (2461 posts) Registered: 02/29/2008 08:29PM Main British Car: 1973 MGB roadster 260 Ford V8 |
Re: T5 5th Gear "Rattle"
Mickey, I think Synchromesh oil is the best. I would check transmission mount and U joints. Could also be the snap ring that keeps the gears in place came loose.
Edited 2 time(s). Last edit at 02/07/2018 03:34AM by mgb260. |
Mickey Richaud Mickey Richaud Townsend TN (198 posts) Registered: 08/25/2015 06:36AM Main British Car: '03 Jaguar XK8 Jaguar 4.2 |
Re: T5 5th Gear "Rattle"
Thanks, Jim.
I emailed Stan, and he said the rear cluster shaft bearing might need a thicker shim. I've asked him if this is something I can live with, or if it has to be addressed to avoid failure. The adventure continues! |
Mickey Richaud Mickey Richaud Townsend TN (198 posts) Registered: 08/25/2015 06:36AM Main British Car: '03 Jaguar XK8 Jaguar 4.2 |
Re: T5 5th Gear "Rattle"
If it were the snap ring, would it not make noise in all gears? Same with mounts and u-joints? The noise is really only in fifth and very rarely in fourth, both under load/lugging situation.
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MGBV8 Carl Floyd Kingsport, TN (4511 posts) Registered: 10/23/2007 11:32PM Main British Car: 1979 MGB Buick 215 |
Re: T5 5th Gear "Rattle"
Wrong stuff, Mickey.
Synchromesh is for Non-World Class T-5 transmissions with brass synchros. World Class T-5 transmissions all use ATF. The composite fiber lined synchros do not do as well with Synchromesh. Mobil 1 ATF (synthetic) come highly recommended. I have been using Valvoline synthetic ATF for many years now. Loose countershaft bearing is a good possibility. Stop lugging the engine. ;) |
IaTR6 Dennis Costello Central Iowa (191 posts) Registered: 12/29/2007 02:53PM Main British Car: '73 TR 6 '97 Explorer 5.0 |
Re: T5 5th Gear "Rattle"
So, Pro-Force says it may need to have the counter gear shimmed? Shouldn't that have been done at the time of the rebuild?
I have had two "rebuilt" transmissions, both advertised as "heavy duty", when in fact they were both standard 265 ft lb rated. The first had an interior case that looked like an old crankcase it was so dirty. The second, had the 5th-reverse pivot bolt removed, and reinstalled finger tight without sealant on the threads. Watch the video by Paul Cangliosi (sp?) at 5speeds.com. Dennis |
mgb260 Jim Nichols Sequim,WA (2461 posts) Registered: 02/29/2008 08:29PM Main British Car: 1973 MGB roadster 260 Ford V8 |
Re: T5 5th Gear "Rattle"
Carl, You are right on fluid recommendation but a lot of guys have switched to Synchromesh in the WC T5 instead of ATF and have smoother shifting and more durability. The older NWC T5 was supposed to use 70-90 WT G4 and has brass synchros. Synchromesh is formulated for newer transmissions and will work with both kinds of synchros.
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Mickey Richaud Mickey Richaud Townsend TN (198 posts) Registered: 08/25/2015 06:36AM Main British Car: '03 Jaguar XK8 Jaguar 4.2 |
Re: T5 5th Gear "Rattle"
I put Synchromesh in it, based on research I'd done and Stan's recommendation. In an email this morning, Stan said he's now recommending Mobile 1 Synthetic. Suggested I drain it and see how the fluid looks, and then switch to the Mobile 1. That's the plan for now.
Stan also checked his notes on the rebuild and found that he replaced my "large fifth gear and bearings"; he then wondered if it could be the yoke or the driveshaft. Since I've had the noise from the beginning, it may well be one of those. Thanks for the input. Keep it coming! |
MGBV8 Carl Floyd Kingsport, TN (4511 posts) Registered: 10/23/2007 11:32PM Main British Car: 1979 MGB Buick 215 |
Re: T5 5th Gear "Rattle"
Hold the phone!
Quote: [www.allfordmustangs.com] Quote: [vb.foureyedpride.com] |
Mickey Richaud Mickey Richaud Townsend TN (198 posts) Registered: 08/25/2015 06:36AM Main British Car: '03 Jaguar XK8 Jaguar 4.2 |
Re: T5 5th Gear "Rattle"
Carl -
Care to translate? Not sure where that's taking me. Mobil 1 or Synchromesh or Dexron III or Royal Purple Synchromax? Any real difference? |
MGBV8 Carl Floyd Kingsport, TN (4511 posts) Registered: 10/23/2007 11:32PM Main British Car: 1979 MGB Buick 215 |
Re: T5 5th Gear "Rattle"
Biggest takeaway for me was Ford & GM always used ATF in their T-5 trannies. Dexron II (ATF that is NLA) was specified for NWC. I did not know that.
Use the Mobil 1 synthetic, Mickey. Then, try to find your noise. |
mgb260 Jim Nichols Sequim,WA (2461 posts) Registered: 02/29/2008 08:29PM Main British Car: 1973 MGB roadster 260 Ford V8 |
Re: T5 5th Gear "Rattle"
Carl, Being a Jeep Guy is probably where I got my info. The old Dexron was thicker, around 20WT. Synchromesh is similar to 30WTin viscosity. I have run it in NWC and have heard many recommendations for the WC T5. It is expensive though. How much is a QT of Mobile 1 ATF?
Edited 1 time(s). Last edit at 02/09/2018 10:22AM by mgb260. |
BlownMGB-V8 Jim Blackwood 9406 Gunpowder Rd., Florence, KY 41042 (6468 posts) Registered: 10/23/2007 12:59PM Main British Car: 1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS |
Re: T5 5th Gear "Rattle"
Mobil 1 is almost as expensive as Synchromesh, but not quite. My early(ish) TKO came with documents recommending Synchromesh, so let's just add that to the confusion. I felt like it should have been a little quicker on the shifts but I'm not sure if that means Dextron-III or Mobil 1 would be better or not.
Jim |
Charles Charles Long McDonald, TN (177 posts) Registered: 09/15/2013 08:54AM Main British Car: 1966 MGB V6 1994 Camaro 3.4L 60V6 |
Re: T5 5th Gear "Rattle"
Mickey, if it helps the fluid that was in my T5 is red. I know cause it drips on a white towel when we get home. I plan to fix the leak but I will need to use a BFH on the car body to make clearance to tighten the drain plug.
Get some ear plugs or go deaf like me and carry go. Carry AAA card, a cell, and credit card, and a few adult beverages for the wait on AAA. Regards charles |
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Mickey Richaud Mickey Richaud Townsend TN (198 posts) Registered: 08/25/2015 06:36AM Main British Car: '03 Jaguar XK8 Jaguar 4.2 |
Re: T5 5th Gear "Rattle"
Thanks, Charles - knew I could depend on you! :-)
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302GT Larry Shimp (240 posts) Registered: 11/17/2007 01:13PM Main British Car: 1968 MGB GT Ford 302 crate engine |
Re: T5 5th Gear "Rattle"
My rattle was caused by stiff springs in the clutch hub. It occurred below about 2000 rpm. The original clutch may have been a McCloud (I do not really remember...) but I now have a King Cobra and all is quiet.
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Mickey Richaud Mickey Richaud Townsend TN (198 posts) Registered: 08/25/2015 06:36AM Main British Car: '03 Jaguar XK8 Jaguar 4.2 |
Re: T5 5th Gear "Rattle"
Thanks, Larry. Was that in all gears? Mine's only in fifth, with the occasional fourth-gear flareup.
Also, it seems like it's less pronounced when the weather's cold, until things warm up. That suggests it may be related to the fluid. Haven't switched the fluid out yet, but then I haven't driven it much either. |