When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
i'm fixin to order a new driveshaft for my ss700 installation and I need to know how much 'free space' to leave in the yoke to accommodate the in/out movement of the front yoke with full suspension travel (up/down) so that the tailshaft doesn't hit the plug.
and the other side of the coin... minimum insertion on the tailshaft.
Not just travel up/down, the pinion will want to thrust forward in an arc under acceleration. The up down can be figured out with a little trig, based on DS length and DS angle.
The up/down is the most minor part of it. I would allow 1.25" minimum, I wouldn't go less than that. I would feel more conformable with 1.5", but that also depends on the yoke length, and amount of tail shaft engagement, and how much HP you are putting to the ground,and your spring setup forward of the rear axle.
Don't forget that early vettes used a long yoke to accommodate all the in/out movement from the short driveline. A standard passenger car length will be too short. If memory serves me right, the barrel is about 5-1/2" long.
Don't forget that early vettes used a long yoke to accommodate all the in/out movement from the short driveline. A standard passenger car length will be too short. If memory serves me right, the barrel is about 5-1/2" long.
Regards, John McGraw
John
the yoke used in the SS700 is a Ford yoke. just measured it, the outside smooooth length of the barrel is 4-3/4" and the splined interior length to the plug is 5-1/4". the GM yoke i've used for 38 years is 3-3/4" outside (which i would guess is the short GM yoke....)
Bill
Bill, you can contact the folks at Inland Empire Driverline if you want a more difinitive answer. These folks build custom as well as replacement driveshafts for a myriad of vendors, including JEGS and Summit. We just ordered a replacement driveshaft for a customers 1968 Z-28 and they were incredibly detailed in their measurement requirements. Even though we ordered what on the surface appeared to be a factory replacement from Summit, Inland asked that we call them to go over the measurements.
In the end the driveshaft arrived balanced and ready to install, just needing to be painted. I believe that we ended up with just under an inch of free play on the output shaft when installed.
Bill, you can contact the folks at Inland Empire Driverline if you want a more difinitive answer. These folks build custom as well as replacement driveshafts for a myriad of vendors, including JEGS and Summit. We just ordered a replacement driveshaft for a customers 1968 Z-28 and they were incredibly detailed in their measurement requirements. Even though we ordered what on the surface appeared to be a factory replacement from Summit, Inland asked that we call them to go over the measurements.
In the end the driveshaft arrived balanced and ready to install, just needing to be painted. I believe that we ended up with just under an inch of free play on the output shaft when installed.
Good luck... GUSTO
i have so far talked to 2 florida based fabricators; 1 said he used 3" insertion and the other said he used 1" of 'free play'.
i contacted Inland Empire once upon a time and they were VERY expensive....
i have so far talked to 2 florida based fabricators; 1 said he used 3" insertion and the other said he used 1" of 'free play'.
i contacted Inland Empire once upon a time and they were VERY expensive....
thanks
Bill
Bill
I hear you, although I didn't think the cost through Summit was excessive considering what everything else for a '68 Z-28 costs. I did find them more than willing to share their experience and knowledge regarding the manufacturing of the driveshaft and would probably call them again if I needed guidance in the future.
By the way, 3" insertion and 1" of free-play are not mutually exclusive. Based on the yoke that they used on our Z-28 shaft, I'd say we're pretty close to those two numbers with the shaft they provided.
I hear you, although I didn't think the cost through Summit was excessive considering what everything else for a '68 Z-28 costs. I did find them more than willing to share their experience and knowledge regarding the manufacturing of the driveshaft and would probably call them again if I needed guidance in the future.
By the way, 3" insertion and 1" of free-play are not mutually exclusive. Based on the yoke that they used on our Z-28 shaft, I'd say we're pretty close to those two numbers with the shaft they provided.
Good luck... GUSTO
not 'exclusive' in the case of the ss700 yoke as i have a total of 4-3/4" to play with. the 'old' yoke at 3-3/4" worked too...
Bill
driveshaft is being made today. decided to have the old one shortened as there isn't much chance I will be going back to a MY6 or a Muncie (of course, never say never..... )
driveshaft is now installed but I don't want to drive it til I install a speedometer gear (big open hole in trans were 'stuff' might get in/come out...)
called Legend Gear and they told me that with a 3.36 rer and an approx 25" tire, to get a 19 tooth driven gear. had to order it from Ford....
Bill
driveshaft is now installed but I don't want to drive it til I install a speedometer gear (big open hole in trans were 'stuff' might get in/come out...)
called Legend Gear and they told me that with a 3.36 rer and an approx 25" tire, to get a 19 tooth driven gear. had to order it from Ford....
Bill
Bill,
I doubt your rear tires are 25" (more like a tad over 27").
John
tire rack says a 2157015 is approx 27". according to Legend Gear, the drive gear has 11 teeth.
Bill
Bill,
Something "does not compute". According to the TCI calculator, 11 tooth drive gear with a 3.36 rear gear, and a 27" tire needs a ~27 tooth driven gear.
Also, the TCI calculator does not show a 11" Ford drive gear.
I have a '65 but just to to re-reinforce your speedo gear issue. I have an LGT-700 with 3.36 gears and a 26" tall tire. Bowler Transmission sent me this assembly with a yellow gear saying this is the correct application.
03-13-2015, 06:27 PM
62 driveshaft front yoke in/out movement
)
