Re: Driveline advice please & street burnouts
[Re: radar]
#2661793
06/03/19 11:01 AM
06/03/19 11:01 AM
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Joined: Sep 2003
Posts: 19,405 north of coder
moparx
"Butt Crack Bob"
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"Butt Crack Bob"
Joined: Sep 2003
Posts: 19,405
north of coder
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NO neutral drops or J-hooks [fast as you can in reverse, then hook low] - EVER !! [ ] how those pushbutton 727 transmissions didn't kill us back in the day, i'll never know. my little brother even tried that with /6, 904 column shift darts. [i replaced many 7 1/2" rears with him doing that. wonder where he learned those tricks ? ]
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Re: Driveline advice please & street burnouts
[Re: radar]
#2661817
06/03/19 11:39 AM
06/03/19 11:39 AM
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Joined: Aug 2003
Posts: 43,176 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,176
Bend,OR USA
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I've never tried doing a water burnout with a regular full automatic valve body You might want to apply the front brakes and start the burn out in low gear at very light throttle pressure so the RPM do not get above 3000 rpm before shifting into second or high gear Once it shifts out of low gear shoot for between 5000 RPM and 6500 RPM to get the tire speed up to make heat I start my burnouts in 2nd gear and shift it into high on all my race 727 trannys with manual valve bodies, I try to keep the rpm below 6500 RPM also but I have seen the tach at or near 7300 RPM before I let up on the throttle to get the RPM down What do you mean about "playing wit it in high gear" ?
Last edited by Cab_Burge; 06/03/19 11:41 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Driveline advice please & street burnouts
[Re: Cab_Burge]
#2661845
06/03/19 12:44 PM
06/03/19 12:44 PM
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Joined: Jul 2007
Posts: 1,682 Philadelphia
radar
OP
top fuel
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OP
top fuel
Joined: Jul 2007
Posts: 1,682
Philadelphia
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I've never tried doing a water burnout with a regular full automatic valve body You might want to apply the front brakes and start the burn out in low gear at very light throttle pressure so the RPM do not get above 3000 rpm before shifting into second or high gear Once it shifts out of low gear shoot for between 5000 RPM and 6500 RPM to get the tire speed up to make heat I start my burnouts in 2nd gear and shift it into high on all my race 727 trannys with manual valve bodies, I try to keep the rpm below 6500 RPM also but I have seen the tach at or near 7300 RPM before I let up on the throttle to get the RPM down What do you mean about "playing wit it in high gear" ? Thanks Cab I have a tf2 kit installed which is supposed to allow manual or automatic shifting. So if I want to drag race I can warm up slicks in 2/3 then slap up through the gears from 1 at the green lite with my ratchet shifter. While it’s in manual 1 I think the sprag shares duties with a band so that’s good. By playing around in D I mean when I am using Drive and letting the transmission shift for me. The kit makes my shifts pretty firm and a decent amount of throttle will make the trans hold my gears to 4500 or a little higher. What makes me nervous is that if I understand it right when you’re in Drive and take off from a stop that’s breakaway low- like 1st but with no low band apply so no engine braking and only the sprag holding the rear drum. So not the same as hammering it in a full manual valve body that has engine braking and will heat up the atf trying to take off from a stop in 3rd with 1:1 gearing. Matter of fact I think the TF2 kit allows downshifts at any speed but selecting 2 might still cycle through breakaway low as well? Drag strip procedure has been beat to death here- burn em in 2, etc, but if I want to surprise a mustang at a stoplight and I’m in Drive/auto, give it too much gas & fry tires instead of jumping am I all done or can I pedal it a little to get traction again? Or will that kind of shenanigans hammer my sprag in short order? I’m not doing neutral drops or any stupid stuff.
Last edited by radar; 06/03/19 12:48 PM. Reason: Typos
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Re: Driveline advice please & street burnouts
[Re: radar]
#2661870
06/03/19 01:46 PM
06/03/19 01:46 PM
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Joined: Jan 2003
Posts: 13,363 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,363
Marion, South Carolina [><]
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FWIW...the driveshaft in my cuda was made by a local truck/driveline shop. It is a 3" diameter shaft and I was told .090" wall tubing. It may very well be the same .083" tubing your shop uses. It's been in my car for several years and has taken a lot of abuse. Close to 3900 lbs running high 8s and using a transbrake.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: Driveline advice please & street burnouts
[Re: an8sec70cuda]
#2661881
06/03/19 02:08 PM
06/03/19 02:08 PM
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Joined: Jul 2007
Posts: 1,682 Philadelphia
radar
OP
top fuel
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OP
top fuel
Joined: Jul 2007
Posts: 1,682
Philadelphia
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I dropped off my slip yoke and solid 1350 joints at the driveshaft shop this morning. He said same price for 3” or 3.5” and I have plenty of room for 1/4” per side clearance so I went for the 3.5”. I’m thinking this should be plenty strong- time to find the next weakest link!
I really hope the weakest part of my driveline will always be the tires vs the asphalt. That was my original plan- I’m only running 255/50-17 rears and plan to upgrade to the M&H 28” drag radials. I thought for sure in a pickup even with a heavy wood bed I would always break traction before parts.
So it looks like it just is what it is playing in the street with a tf2/727. Don’t be a jerk or 15 year old in a stolen car and cross your fingers the fun lasts awhile. I will definitely use manual 2 for any planned rolling burnouts that start from a standstill with my foot on the brake- treat the street like a water box. But if I’m in Drive and want to play a little bit I’ll just try to be smart. I can’t really use full throttle until third gear anyway so mashing it is only a recipe for instant smoky fishtails.
I had been leaving it in D, holding the brake, mashing the gas, waiting a second for the street tires to get a little greasy hot then letting off and leaving 8-15 foot stripes all over the place. Not for fun or to show off- I’m a grownup 😉 I do it for the kids!
Last edited by radar; 06/03/19 02:09 PM.
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