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Unread 04-02-2013, 06:47 PM   #16
super98lsc
Web Wheeler
1999 WJ 
 
Join Date: May 2006
Location: Austin, TX
Posts: 1,414
what is the idle speed at?

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06-Corvette z51-6spd,b&b,K&N low miles.
77-Corvette Stingray 496 BBC/TH400 built 667hp+
===================================
00 WJ 4x4, 4.7 stroker, turbocharged,..lots more..
01 WJ 4x2 4.7v8 Limited (needs valve job)
90 Grand Wagoneer 401 Edelbrock Heads, Lunati .510/.527 FT Cam, Edelbrock RPM Air Gap, Holley HP 750, Thorley Headers, HEI, Electric Fan w Digital controller,4" lift 31x10.50 Goodyear Duratrac's on Pro-Comp Wheels,new interior, seats,seals,Alpine and JL full system, Remote HEI, Clifford 2 way with remote start,windows,tailgate.
96 Cherokee Country 4dr/2x2 White/Tan 3" Lift Sahara 18" Wheels 32.5"'s 99up head and intake- for sale soon!
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Unread 04-03-2013, 09:25 AM   #17
jeepdj5
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1982 FSJ Cherokee 
 
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Changing the tranny fluid is not bad!!! It says in the book to change it after so many miles not "don't ever change it" I changed mine (pretty black dirty) it shifts the same!!! Plus I have that good feeling that I have good fluid in my tranny!! Mine also makes a clunk when I go from drive to reverse I have checked it out it is slop in the AMC 20 diff!!! Put it in neutral (not running and not where it can roll wile your under the truck) and grab the drive shaft and turn it back and forth see how much slop there is in the diff!!!! Change ALL the fluids if its never been done!!! good luck

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Unread 04-03-2013, 09:27 AM   #18
Dave145
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1976 FSJ Cherokee 
 
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Yep. Its all in the idle speed. I know that mine does it too and I'm working on adjusting it to fix that issue
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Unread 04-03-2013, 09:31 AM   #19
jeepdj5
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Quote:
Originally Posted by Dave145
Yep. Its all in the idle speed. I know that mine does it too and I'm working on adjusting it to fix that issue
That could be it too!!! Should be around 800-900

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Unread 04-03-2013, 09:34 AM   #20
Dave145
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Mines at 600 and it fixed the issue pretty well...maybe I should raise it just a bit
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Unread 04-03-2013, 11:28 AM   #21
super98lsc
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My idle with a mild cam is at 625 to 650 and I dont run a choke, and I use the AC which brings it down to 600 when compressor is on. For a stock stall speed you dont want or need idle above 700rpm. If it stalls, shakes, etc below that then something else like timing, vac leaks etc are out of whack.
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06-Corvette z51-6spd,b&b,K&N low miles.
77-Corvette Stingray 496 BBC/TH400 built 667hp+
===================================
00 WJ 4x4, 4.7 stroker, turbocharged,..lots more..
01 WJ 4x2 4.7v8 Limited (needs valve job)
90 Grand Wagoneer 401 Edelbrock Heads, Lunati .510/.527 FT Cam, Edelbrock RPM Air Gap, Holley HP 750, Thorley Headers, HEI, Electric Fan w Digital controller,4" lift 31x10.50 Goodyear Duratrac's on Pro-Comp Wheels,new interior, seats,seals,Alpine and JL full system, Remote HEI, Clifford 2 way with remote start,windows,tailgate.
96 Cherokee Country 4dr/2x2 White/Tan 3" Lift Sahara 18" Wheels 32.5"'s 99up head and intake- for sale soon!
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Unread 04-03-2013, 10:04 PM   #22
Gante
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Quote:
Originally Posted by super98lsc
what is the idle speed at?
I don't have a tool to find out the idle speed but it actually sound like a low idle speed.
One thing to note is that the engine seems to stall a little when I put it in Drive and even the interior lights dim down a little... Does that tell anything to anyone?
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Unread 04-03-2013, 10:10 PM   #23
Gante
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Quote:
Originally Posted by jeepdj5
Put it in neutral (not running and not where it can roll wile your under the truck) and grab the drive shaft and turn it back and forth see how much slop there is in the diff!!!! Change ALL the fluids if its never been done!!! good luck

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I'll check the differential as suggested. What would this tell me if there is a bit of slop or not?
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Unread 04-04-2013, 08:17 AM   #24
jeepdj5
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Quote:
Originally Posted by Gante
I'll check the differential as suggested. What would this tell me if there is a bit of slop or not?
Not sure mine has been that way since I got it, since its a wide track Cherokee I'm going to replace the rear axel with a j10 Dana 44

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Unread 04-05-2013, 06:48 PM   #25
super98lsc
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1999 WJ 
 
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Location: Austin, TX
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Wear leads to excessive backlash on the gears they will clang/clunk when engaged. There was a valvebody mod for the 42re (727 based light duty overdrive for the 4.0 Jeeps) that would soften the reverse engagement. You might also check band adjustment. If the reverse band is too loose it will slam harshly into the low reverse drum on engagement. Is it the same if you go from neutral to manual 1? Quickly dont stop at all the detents. not certain if a VB mod exists for the 727.
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06-Corvette z51-6spd,b&b,K&N low miles.
77-Corvette Stingray 496 BBC/TH400 built 667hp+
===================================
00 WJ 4x4, 4.7 stroker, turbocharged,..lots more..
01 WJ 4x2 4.7v8 Limited (needs valve job)
90 Grand Wagoneer 401 Edelbrock Heads, Lunati .510/.527 FT Cam, Edelbrock RPM Air Gap, Holley HP 750, Thorley Headers, HEI, Electric Fan w Digital controller,4" lift 31x10.50 Goodyear Duratrac's on Pro-Comp Wheels,new interior, seats,seals,Alpine and JL full system, Remote HEI, Clifford 2 way with remote start,windows,tailgate.
96 Cherokee Country 4dr/2x2 White/Tan 3" Lift Sahara 18" Wheels 32.5"'s 99up head and intake- for sale soon!
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Unread 04-05-2013, 08:07 PM   #26
jeepdj5
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Quote:
Originally Posted by super98lsc
Wear leads to excessive backlash on the gears they will clang/clunk when engaged. There was a valvebody mod for the 42re (727 based light duty overdrive for the 4.0 Jeeps) that would soften the reverse engagement. You might also check band adjustment. If the reverse band is too loose it will slam harshly into the low reverse drum on engagement. Is it the same if you go from neutral to manual 1? Quickly dont stop at all the detents. not certain if a VB mod exists for the 727.
I thought it was the diff, ur sayin tranny?

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Unread 04-06-2013, 08:38 AM   #27
super98lsc
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1999 WJ 
 
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Location: Austin, TX
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Saying could be iether or combo of both. Need to preload the drive line and hold the tension on the driveshaft.. This is dangerous but I do this with someone I trust. Lock the parking brake chock all 4 wheels lay under truck hold the drive shaft while somone in the truck shifts through the gears at idle. If you feel or see the shaft turn quite a bit before catching, clang etc then its play in the driveline. if the clang comes and the shaft hardly moves its in the Trans. A good driveline or Trans shop can check this if you dint want to risk it.
__________________
www.mangierisrc.com
06-Corvette z51-6spd,b&b,K&N low miles.
77-Corvette Stingray 496 BBC/TH400 built 667hp+
===================================
00 WJ 4x4, 4.7 stroker, turbocharged,..lots more..
01 WJ 4x2 4.7v8 Limited (needs valve job)
90 Grand Wagoneer 401 Edelbrock Heads, Lunati .510/.527 FT Cam, Edelbrock RPM Air Gap, Holley HP 750, Thorley Headers, HEI, Electric Fan w Digital controller,4" lift 31x10.50 Goodyear Duratrac's on Pro-Comp Wheels,new interior, seats,seals,Alpine and JL full system, Remote HEI, Clifford 2 way with remote start,windows,tailgate.
96 Cherokee Country 4dr/2x2 White/Tan 3" Lift Sahara 18" Wheels 32.5"'s 99up head and intake- for sale soon!
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Unread 04-06-2013, 09:40 AM   #28
jeepdj5
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1982 FSJ Cherokee 
 
Join Date: Jan 2012
Posts: 865
Quote:
Originally Posted by super98lsc
Saying could be iether or combo of both. Need to preload the drive line and hold the tension on the driveshaft.. This is dangerous but I do this with someone I trust. Lock the parking brake chock all 4 wheels lay under truck hold the drive shaft while somone in the truck shifts through the gears at idle. If you feel or see the shaft turn quite a bit before catching, clang etc then its play in the driveline. if the clang comes and the shaft hardly moves its in the Trans. A good driveline or Trans shop can check this if you dint want to risk it.
Hey you can put it in neutral (not running on a level surface) crawl under and turn the drive shaft back and forth to see how much free travel there is in the diff

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