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swapping out an 8 3/4 rear #175329 12/26/08 12:49 PM 12/26/08 12:49 PM
Joined: Feb 2003 Posts: 455 Ashburn, Virginia A ashburnmike OP mopar
ashburnmike OP mopar A Joined: Feb 2003 Posts: 455 Ashburn, Virginia	Hello all, I'd like to try and swap out the 3.91 chunk and replace them w/3.23 in my Dart. What does it take to do this. Do I need special tools? Is there anything I should be aware of before attemping this? thanks Mike

Re: swapping out an 8 3/4 rear [Re: ashburnmike] #175330 12/26/08 01:00 PM 12/26/08 01:00 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	swapping one chunk for another? You only need a gasket w cement(my preference), several qts of the appropriate gear oil, a small bottle of the sure grip additive, Check & see if the flanges take the same size u joint, get the pumpkin seated all the way into the housing,only pull the axles out far enough for the pumpkin to come forward, adj end play when you're done. & last but not least give me 1st dibs on the 3.91 live every 24 hour block of time like it's your last day on earth

Re: swapping out an 8 3/4 rear [Re: RapidRobert] #175331 12/26/08 01:10 PM 12/26/08 01:10 PM
Joined: Feb 2003 Posts: 455 Ashburn, Virginia A ashburnmike OP mopar
ashburnmike OP mopar A Joined: Feb 2003 Posts: 455 Ashburn, Virginia	sure thing..you have first dibs. If that's all there is to it,great. it seems too easy. I didn't realize how that low a gear really runs up the rpms @ 55 mph.

Re: swapping out an 8 3/4 rear [Re: ashburnmike] #175332 12/26/08 01:15 PM 12/26/08 01:15 PM
Joined: Jan 2003 Posts: 32,928 Grand Prairie,Texas stumpy I Win
stumpy I Win Joined: Jan 2003 Posts: 32,928 Grand Prairie,Texas	Here's a little toy for seeing what gear and tire changes do to RPMs. http://vexer.com/68rt/speed.html

Re: swapping out an 8 3/4 rear [Re: ashburnmike] #175333 12/26/08 01:19 PM 12/26/08 01:19 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Quote: sure thing..you have first dibs. I didn't realize how that low a gear really runs up the rpms @ 55 mph. yes that will be difficult to deal with but I feel up to it . The only other thing I can think if is if both of the chunks have the thrust buttons on there where the axles but together you wont have any problem with resetting your end play & you want it on the low side ~ .010" or so. live every 24 hour block of time like it's your last day on earth

Re: swapping out an 8 3/4 rear [Re: RapidRobert] #175334 12/26/08 01:21 PM 12/26/08 01:21 PM
Joined: Aug 2003 Posts: 4,384 Madison Wi NTOLERANCE master
NTOLERANCE master Joined: Aug 2003 Posts: 4,384 Madison Wi	Regarding the thrust buttons, they have a tendency to fall out, so keep an eye out for them. Youll need them for reassembly, assuming you have all oem bearings and components. I used to care but....... things have changed

Re: swapping out an 8 3/4 rear [Re: RapidRobert] #175335 12/26/08 01:22 PM 12/26/08 01:22 PM
Joined: Feb 2003 Posts: 455 Ashburn, Virginia A ashburnmike OP mopar
ashburnmike OP mopar A Joined: Feb 2003 Posts: 455 Ashburn, Virginia	how do you adjust the end play?

Re: swapping out an 8 3/4 rear [Re: ashburnmike] #175336 12/26/08 01:28 PM 12/26/08 01:28 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	there is a threaded adjuster on the passenger side located on the axle flange in between the brake shoes. just have the axle up on 2 jack stands during all of this(the R&R & the adjusting) live every 24 hour block of time like it's your last day on earth

Re: swapping out an 8 3/4 rear [Re: stumpy] #175337 12/26/08 01:43 PM 12/26/08 01:43 PM
Joined: Feb 2003 Posts: 455 Ashburn, Virginia A ashburnmike OP mopar
ashburnmike OP mopar A Joined: Feb 2003 Posts: 455 Ashburn, Virginia	thanks. I wish I had that when the 3.91's went in...it's right on the money w/ the current rpms.

Re: swapping out an 8 3/4 rear [Re: RapidRobert] #175338 12/26/08 01:45 PM 12/26/08 01:45 PM
Joined: Feb 2003 Posts: 455 Ashburn, Virginia A ashburnmike OP mopar
ashburnmike OP mopar A Joined: Feb 2003 Posts: 455 Ashburn, Virginia	Quote: there is a threaded adjuster on the passenger side located on the axle flange in between the brake shoes. just have the axle up on 2 jack stands during all of this(the R&R & the adjusting) How will I know when it's adjusted correctly?

Re: swapping out an 8 3/4 rear [Re: ashburnmike] #175339 12/26/08 01:54 PM 12/26/08 01:54 PM
Joined: Sep 2003 Posts: 3,426 weymouth,mass. M meepmeep70 master
meepmeep70 master M Joined: Sep 2003 Posts: 3,426 weymouth,mass.	you want no more then ten thousandths of an inch,you may want to borrow or buy a dial indicator,fairly cheep and handy to have. good luck

Re: swapping out an 8 3/4 rear [Re: meepmeep70] #175340 12/26/08 01:55 PM 12/26/08 01:55 PM
Joined: Feb 2003 Posts: 455 Ashburn, Virginia A ashburnmike OP mopar
ashburnmike OP mopar A Joined: Feb 2003 Posts: 455 Ashburn, Virginia	Quote: you want no more then ten thousandths of an inch,you may want to borrow or buy a dial indicator,fairly cheep and handy to have. good luck Thanks for the help everyone...off to the garage

Re: swapping out an 8 3/4 rear [Re: ashburnmike] #175341 12/26/08 03:52 PM 12/26/08 03:52 PM
Joined: Jan 2003 Posts: 25,200 Upper Midwest M MoparforLife Too Many Posts
MoparforLife Too Many Posts M Joined: Jan 2003 Posts: 25,200 Upper Midwest	Go here for the adjustment: http://www.moparts.org/Tech/Archive/axle/12.html Clean it, if it's Dirty. Oil it, if it Squeaks. But: Don't fix it, if it Works!

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