Reverse does not work
01-21-2019, 05:06 PM
#11
Banned
Join Date: Jan 2018
Location: Pennsylvania
Posts: 2,327
Not sure a Pan drop is 8 quarts, but should have this much on hand, just in case...
It's 12 Quarts for a dry-fill.
5-Quarts for a drain plug removal and fill.
5.5 to 6.5 for pan drop and filter. Got to take into account, the saturated filter...
I think eight would over-fill it, but doing the fill procedure will drain what's not needed all back out
anyway. Removing the reverse servo MAY produce another pint+ in fluid loss...
I modified a 1 gallon bug sprayer to fill transmissions that have to be done this way...
It's 12 Quarts for a dry-fill.
5-Quarts for a drain plug removal and fill.
5.5 to 6.5 for pan drop and filter. Got to take into account, the saturated filter...
I think eight would over-fill it, but doing the fill procedure will drain what's not needed all back out
anyway. Removing the reverse servo MAY produce another pint+ in fluid loss...
I modified a 1 gallon bug sprayer to fill transmissions that have to be done this way...
01-22-2019, 04:07 AM
#12
Thread Starter
Join Date: Jan 2019
Location: Espaņa
Posts: 7
You most likely do not need to rebuild the transmission.
It is possible and just as simple that, the Reverse servo needs to be taken out and cleaned.
In the ASTG Technical Buliten 08'Mustangdude posted (that shows the reverse servo and its components), the Reverse Servo Molded Piston has a black rubber like seal that is used to create the hydraulic pressure that engages the reverse gear. If this seal gets hardened, cracks, tears or gets stuck from dirt, pressure does not get built up like it is supposed to so, you lose reverse gear.
That servo piston is available by itself as PN 4L2Z-7D189-AA
The other seal in there called the Inner 'D ring seal' is PN 2L2Z-7423-AA
To access the servo you need to drain the fluid and drop the pan. It's four simple bolts. Then dismantle the servo, clean everything, install a new piston and seal and reassemble the servo before reinstalling into the transmission. You will need about 8 quarts of MERCON V or equivalent fluid to refill the transmission. While you are in there you may as well replace the transmission filter (two additional botls).
It is possible and just as simple that, the Reverse servo needs to be taken out and cleaned.
In the ASTG Technical Buliten 08'Mustangdude posted (that shows the reverse servo and its components), the Reverse Servo Molded Piston has a black rubber like seal that is used to create the hydraulic pressure that engages the reverse gear. If this seal gets hardened, cracks, tears or gets stuck from dirt, pressure does not get built up like it is supposed to so, you lose reverse gear.
That servo piston is available by itself as PN 4L2Z-7D189-AA
The other seal in there called the Inner 'D ring seal' is PN 2L2Z-7423-AA
To access the servo you need to drain the fluid and drop the pan. It's four simple bolts. Then dismantle the servo, clean everything, install a new piston and seal and reassemble the servo before reinstalling into the transmission. You will need about 8 quarts of MERCON V or equivalent fluid to refill the transmission. While you are in there you may as well replace the transmission filter (two additional botls).
01-22-2019, 04:08 AM
#13
Thread Starter
Join Date: Jan 2019
Location: Espaņa
Posts: 7
Not sure a Pan drop is 8 quarts, but should have this much on hand, just in case...
It's 12 Quarts for a dry-fill.
5-Quarts for a drain plug removal and fill.
5.5 to 6.5 for pan drop and filter. Got to take into account, the saturated filter...
I think eight would over-fill it, but doing the fill procedure will drain what's not needed all back out
anyway. Removing the reverse servo MAY produce another pint+ in fluid loss...
I modified a 1 gallon bug sprayer to fill transmissions that have to be done this way...
It's 12 Quarts for a dry-fill.
5-Quarts for a drain plug removal and fill.
5.5 to 6.5 for pan drop and filter. Got to take into account, the saturated filter...
I think eight would over-fill it, but doing the fill procedure will drain what's not needed all back out
anyway. Removing the reverse servo MAY produce another pint+ in fluid loss...
I modified a 1 gallon bug sprayer to fill transmissions that have to be done this way...
01-22-2019, 12:33 PM
#14
Gentleman's Relish
Join Date: Feb 2005
Location: AZ
Posts: 13,090
Not sure a Pan drop is 8 quarts, but should have this much on hand, just in case...
It's 12 Quarts for a dry-fill.
5-Quarts for a drain plug removal and fill.
5.5 to 6.5 for pan drop and filter. Got to take into account, the saturated filter...
I think eight would over-fill it, but doing the fill procedure will drain what's not needed all back out
anyway. Removing the reverse servo MAY produce another pint+ in fluid loss...
I modified a 1 gallon bug sprayer to fill transmissions that have to be done this way...
It's 12 Quarts for a dry-fill.
5-Quarts for a drain plug removal and fill.
5.5 to 6.5 for pan drop and filter. Got to take into account, the saturated filter...
I think eight would over-fill it, but doing the fill procedure will drain what's not needed all back out
anyway. Removing the reverse servo MAY produce another pint+ in fluid loss...
I modified a 1 gallon bug sprayer to fill transmissions that have to be done this way...
02-07-2019, 08:21 PM
#17
S197 Section Modder-ator
Join Date: Sep 2007
Location: Orlando FL
Posts: 13,373
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