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#1
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Transmission Stall Test
When doing a transmission replacement with a used 4EAT (stock, 4.11, or 4.44) has anyone here done the stall test as a check out? Is this not recommended for used transmissions?
I know it is supposed to check the condition of the clutch and brake band, torque converter operation and engine performance. I think I was have my stomach in knots if it didn't perform well right after an installation but I guess I would rather know than not. |
#2
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Re: Transmission Stall Test
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It will only test the forward clutch, Torque converter and the engine power. It should stall at about 2500, but it will produce a lot of heat in the ATF, so it should only be done for a few seconds. If the speed is higher it can be the forward clutch slipping, or the torque converter stators one-way clutch slipping. If the stall speed is lower, it is likely that the engine power is down. Just remember that while you are doing it, all the engines power is turned into heat. Harvey.
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One Arm Bloke. Tell it like it is! 95 Lsi. Bordeaux Pearl, Aust. RHD.149,000Kls Subaru BBS wheels. 97 Liberty GX Auto sedan. 320,000Kls. 04 Liberty 30R Auto Premium. 92.000kls. |
#3
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Re: Transmission Stall Test
Sounds pretty much like what I read in the manual. I am considering doing a full check on the 4.44 trans after install. I bought it used but I don't know much else about it. I am considering doing the Stall Test, Time Lag Test, and if I can get the gauges I would like to get the Line Pressure/ transfer clutch pressure tests. However I am thinking it may be better to characterize the transmission doing the road test and check those results before trying the other tests. I know it can't be good to do it for more than a few seconds but it would give peace of mind to know if it was solid and passed everything with flying colors.
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#4
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Re: Transmission Stall Test
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I would try it on the road to check the band in second and top gear, that may have been treated badly. Look for a flair going into third, and look for the box going back and forth to third when driving slow in 4th. band slipping. The later boxes are very good. Harvey.
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One Arm Bloke. Tell it like it is! 95 Lsi. Bordeaux Pearl, Aust. RHD.149,000Kls Subaru BBS wheels. 97 Liberty GX Auto sedan. 320,000Kls. 04 Liberty 30R Auto Premium. 92.000kls. Last edited by oab_au; 04-13-2010 at 07:26 PM. Reason: I put second instead of third sorry. |
#5
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Re: Transmission Stall Test
Thanks! Always nice to bounce ideas and options of smarter people.
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#6
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Re: Transmission Stall Test
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The forward clutch, brake band, reverse clutch, low and reverse brake and one way clutches. General slippage throughout will mean that line pressure is suspect.
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Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
#7
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Re: Transmission Stall Test
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Harvey.
__________________
One Arm Bloke. Tell it like it is! 95 Lsi. Bordeaux Pearl, Aust. RHD.149,000Kls Subaru BBS wheels. 97 Liberty GX Auto sedan. 320,000Kls. 04 Liberty 30R Auto Premium. 92.000kls. |
#8
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Re: Transmission Stall Test
Ok, hopefully this helps
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#9
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Re: Transmission Stall Test
When knowledge is absent, one should check the manuals, i.e. --- section 3 -2 -3; - Performance Test; B - Stall Test, 3 - Evaluation.
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Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
#10
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Re: Transmission Stall Test
Well you can put the lever in 2nd or 3rd, but it will still be in 1st with the forward clutch on. The box won't apply the band till the road speed increases. I suppose you could try the Manual button.
Harvey.
__________________
One Arm Bloke. Tell it like it is! 95 Lsi. Bordeaux Pearl, Aust. RHD.149,000Kls Subaru BBS wheels. 97 Liberty GX Auto sedan. 320,000Kls. 04 Liberty 30R Auto Premium. 92.000kls. |
#11
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Re: Transmission Stall Test
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A stall test by description, does not involve road speed. You side step by claiming that the Subaru manuals are wrong. I do not agree.
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Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
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