Drag Racing Discussions > Front Engine Dragsters
Trans to Rear Coupler Play
dusterdave173:
No room to get your fingers on it it slides easy as pie just have to grab it with something--it has stayed put and worked out well even after a few in and outs and yes it is the dreaded Worm --so me and my neighbor both have one and just keep making lap after lap service on the engine trans is a PIA but really otherwise it has been a great piece cheap as dirt since there are so many of the chassis out there bare and calling out for someone to finish yep he sells a "dream kit" he sold about a hundo of them so ......they are out there
I don't give a @#%& who don't like it I love mine and yes there are many other and maybe better units out there but after finally getting it dialed in she runs like a bracket car and the car works very well, handles great and mine goes nice and straight--the .095 was easy to make nice welds and probably will hold up well as time goes on
PSweeney:
if you have any binding on your coupler, it'll hurt something, either pinion support, tail bushing, or the coupler. It needs to be aligned so it slides easy. You might need to add turnbuckles to the rear of the trans for fine adjustment as it's literally half a turn on a 3/8unf thread from binding up. If you have no trans mount, a 1/4in 6061 motorplate isn't ridged enough to hang the trans from unsupported and it won't slide free unless supported.
rooman:
--- Quote from: PSweeney on March 27, 2017, 02:10:09 AM ---if you have any binding on your coupler, it'll hurt something, either pinion support, tail bushing, or the coupler. It needs to be aligned so it slides easy. You might need to add turnbuckles to the rear of the trans for fine adjustment as it's literally half a turn on a 3/8unf thread from binding up. If you have no trans mount, a 1/4in 6061 motorplate isn't ridged enough to hang the trans from unsupported and it won't slide free unless supported.
--- End quote ---
I disagree re the mid plate. If the motor is not bolted to the other side maybe the plate could flex enough to cause a problem, especially if the frame is excessively wide or the top and bottom rails don't have much vertical spread and are low relative to the crank centerline. I never run a trans mount in my cars and never have problems with binding. In the case of a car where the trans coupler plugs directly into the female unit on the rear end the alignment is more critical but there should not be any issues if the car is built correctly.
I have seen issues when the mid plate is not supported correctly as in a car where the motor has been moved forward from the original location as in an old car that was not built with enough room for a transmission (right Steve? :) ) but in general a transmission mount is not a really good idea or necessary when you have front mounts and a mid plate.
Roo
hotrod316:
:o who me ;)
let me tell you a story 8)
fuel749:
--- Quote from: rooman on March 27, 2017, 04:55:54 AM ---
--- Quote from: PSweeney on March 27, 2017, 02:10:09 AM ---if you have any binding on your coupler, it'll hurt something, either pinion support, tail bushing, or the coupler. It needs to be aligned so it slides easy. You might need to add turnbuckles to the rear of the trans for fine adjustment as it's literally half a turn on a 3/8unf thread from binding up. If you have no trans mount, a 1/4in 6061 motorplate isn't ridged enough to hang the trans from unsupported and it won't slide free unless supported.
--- End quote ---
I disagree re the mid plate. If the motor is not bolted to the other side maybe the plate could flex enough to cause a problem, especially if the frame is excessively wide or the top and bottom rails don't have much vertical spread and are low relative to the crank centerline. I never run a trans mount in my cars and never have problems with binding. In the case of a car where the trans coupler plugs directly into the female unit on the rear end the alignment is more critical but there should not be any issues if the car is built correctly.
I have seen issues when the mid plate is not supported correctly as in a car where the motor has been moved forward from the original location as in an old car that was not built with enough room for a transmission (right Steve? :) ) but in general a transmission mount is not a really good idea or necessary when you have front mounts and a mid plate.
Roo
--- End quote ---
I'm with Roo, never built a car with a trans mount and never had a coupler issue. For some reason it makes people awful nervous to see the trans hanging off the back of the block (especially people new to dragsters) but if they'd take a look around they'd see that it's the norm. Unfortunately, lots of people look but do not see.
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