REBUILT 727 HARSH SHIFT INTO REVERSE ONLY

[oldkimmer]

Exactly, plow truck. Run forward and whip them into reverse. Many times still rolling.
Doug

Answer me this. Why did mopar have updates/tech bulletins in the 90s and possibly the 2000s to add more clearance to the front drum and add a wave snap ring to soften the reverse application?

 

[4406bbl]

Never do the reverse slam, Mopars had an issue, when you warrantyitems you find a fix, it happens more after the shift kit and a tighter converter. Putting a Mopar in reverse was known as experiencing a "direct connection" by trans shops around here. Anyway the transgo fix will help.

 

[HAHNAGON]

Ok. I will try a couple things. Thank you. Now....I am not a professional and I don't know half as much as most people on here. I'm just posting the instructions in case someone doesn't have access to them or is just curious. I also notice that the fsm and transgo say 2 1/2 turns out on the bands?

 

[Dave6T4]

I have seen broken rear band anchors and a folded over strut that dropped out. This last case was in a pickup truck that ran so crappy, that the owner cranked up the curb idle to keep it running. Pulled it into gear, and Wham!

 

[1 Wild R/T]

I have seen broken rear band anchors and a folded over strut that dropped out. This last case was in a pickup truck that ran so crappy, that the owner cranked up the curb idle to keep it running. Pulled it into gear, and Wham!

I've seen the band break, I've seen the front band strut bend... I've seen the rear band anchor come apart... I've never seen the rear band strut bend... It's so short there's not enough leverage to bend it.....

 

[Dave6T4]

I've seen the band break, I've seen the front band strut bend... I've seen the rear band anchor come apart... I've never seen the rear band strut bend... It's so short there's not enough leverage to bend it.....

Yes there is. I dropped the trans pan, and there it was. I have seen an exploded rear servo piston, with the stamped steel spring retainer deformed and pushed through steel clip, and hanging on the servo lever. This on a car with the kickdown lever tied back. Never say never, people will find a way to break it.

 

[dvw]

Answer me this. Why did mopar have updates/tech bulletins in the 90s and possibly the 2000s to add more clearance to the front drum and add a wave snap ring to soften the reverse application?

Good question. I'd like to see the bulletin.
Doug

 

[4406bbl]

Ok. I will try a couple things. Thank you. Now....I am not a professional and I don't know half as much as most people on here. I'm just posting the instructions in case someone doesn't have access to them or is just curious. I also notice that the fsm and transgo say 2 1/2 turns out on the bands?

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Follow their instructions, it also says to remove the restrictor in the front clutch apply if the rpm flares on the 2-3 shift. Follow the instructions and adjust from there.

 

[T Brashears]

One cause of clunk is the direct clutch gets the gear train spinning before the reverse band can stop it. There are some people that are smarter than the people that engineered it. With the exception of Gil Younger and Dave Hardin. They reduce clutch clearances,leave out wave plates or waved snap rings,and increase minimum line well past the forgiving 10% or so. You’ll quickly find out how much side gear slop you have in the diff that way. If all else fails,and it’s beginning to get close to that,pull it and put it back right. Reducing rear band clearance stops the gear train before the clutch gets it spinning,it can be a double edged sword. You can get band drag from crossleaks. I love billet servo parts and put a .020 bleed hole in the servo piston to help exhaust any unwanted oil. I also have a flat sanding table to flatten things out.

 

[dvw]

One cause of clunk is the direct clutch gets the gear train spinning before the reverse band can stop it. There are some people that are smarter than the people that engineered it. With the exception of Gil Younger and Dave Hardin. They reduce clutch clearances,leave out wave plates or waved snap rings,and increase minimum line well past the forgiving 10% or so. You’ll quickly find out how much side gear slop you have in the diff that way. If all else fails,and it’s beginning to get close to that,pull it and put it back right. Reducing rear band clearance stops the gear train before the clutch gets it spinning,it can be a double edged sword. You can get band drag from crossleaks. I love billet servo parts and put a .020 bleed hole in the servo piston to help exhaust any unwanted oil. I also have a flat sanding table to flatten things out.

How can the clutch spin if the input shaft isn't moving?
Doug

 

[oldkimmer]

How can the clutch spin if the input shaft isn't moving?
Doug

And u say u have built trannys for over 40 years OMG. If we have to explain this one too u. Wow!

 

[dvw]

And u say u have built trannys for over 40 years OMG. If we have to explain this one too u.

And u say u have built trannys for over 40 years OMG. If we have to explain this one too u. Wow!

Yup, I must admit I don't know what I was thinking. In neutral the input shaft would definately be spinning.
Doug

 

[oldkimmer]

Yup, I must admit I don't know what I was thinking. In neutral the input shaft would definately be spinning.
Doug

It’s all good Doug. I knew u would see the light sooner than later. Been there b4 myself. Kim

 

[oldkimmer]

Doug, look up the TSB, it’s not that hard. Dodge truck and Dakota. I have heard of guys drilling a 1/16 to 1/8 in hole in the rear servo to soften reverse. I have never did that. Kim