69dejavue Posted January 27, 2008 Report Share Posted January 27, 2008 Does anyone know the top speed or rpm of our drive shafts on the SGT? There are several companies that make a one piece aluminum drive shaft for the SGT and the drive shaft loops for safety but how necessary are they? Link to comment Share on other sites More sharing options...
shelbytexan Posted January 30, 2008 Report Share Posted January 30, 2008 Does anyone know the top speed or rpm of our drive shafts on the SGT? There are several companies that make a one piece aluminum drive shaft for the SGT and the drive shaft loops for safety but how necessary are they? Link to comment Share on other sites More sharing options...
shelbytexan Posted January 30, 2008 Report Share Posted January 30, 2008 i do not no the dr. shaft speed but if you are not racing then there is not really any reason for changing the shaft unless you want quicker accerleration from takeoff. the biggest advantage to the swap is that the aluminum shafts are about half the weight of the steel shafts and this makes the shafts turn more freely.most companies advertise you can get about a tenth of a second better time in the quarter.i called coast driveline in calif. and they said they have no clearance issues with there four inch shaft.the price of the shaft is about 700.00 bucks.with our shelbys being lowered you also havr to buy for about 300.00 a part that that you attach to the rear which is some type of link that keeps the shaft from running at an angle. i am comtemplating having this done .the reason why we have a 2 piece shaft is because of the vibration. coast told me there is no vibration on there aluminum shafts and they race there cars. good luck. Link to comment Share on other sites More sharing options...
69dejavue Posted January 31, 2008 Author Report Share Posted January 31, 2008 i do not no the dr. shaft speed but if you are not racing then there is not really any reason for changing the shaft unless you want quicker accerleration from takeoff. the biggest advantage to the swap is that the aluminum shafts are about half the weight of the steel shafts and this makes the shafts turn more freely.most companies advertise you can get about a tenth of a second better time in the quarter.i called coast driveline in calif. and they said they have no clearance issues with there four inch shaft.the price of the shaft is about 700.00 bucks.with our shelbys being lowered you also havr to buy for about 300.00 a part that that you attach to the rear which is some type of link that keeps the shaft from running at an angle. i am comtemplating having this done .the reason why we have a 2 piece shaft is because of the vibration. coast told me there is no vibration on there aluminum shafts and they race there cars. good luck. Thank you. I was curious if the current drive shaft is safe for that occasional burst to 140+. I understand the aluminum shaft frees up about 10 HP. I know the drive shaft loops are recommended for racing but 140+ is racing speeds. Link to comment Share on other sites More sharing options...
stump_breaker Posted January 31, 2008 Report Share Posted January 31, 2008 Thank you. I was curious if the current drive shaft is safe for that occasional burst to 140+. I understand the aluminum shaft frees up about 10 HP. I know the drive shaft loops are recommended for racing but 140+ is racing speeds. The driveshaft on the SGT is well suited for high speeds. The reason it's a two piece is to reduce the chance of explosion from critical speed - the speed at which the driveshaft comes apart at the seams. Being two small pieces the critical speed is very high. On the one piece the critical speed is much lower but before the other forum was closed, stats on the coast shaft were posted and it was safe. I think critical speed was ~ 7000 rpm (engine rpm/drive gear ratio) or ~150+ mph. I know the numbers say it's ok and there are quite a few guys running the one piece shaft but I had a shaft explode in the middle from hitting critical speed on a Dodge truck. I will stick with the two piece. Also there have been clearance issues with a 4" shaft. It's recommended not to go bigger than 3 1/2". Link to comment Share on other sites More sharing options...
Robbcwz Posted January 31, 2008 Report Share Posted January 31, 2008 Some slightly biased info: http://s197.com/forum/showthread.php?t=1104 Link to comment Share on other sites More sharing options...
69dejavue Posted February 1, 2008 Author Report Share Posted February 1, 2008 great information and instructions. Thank you! Link to comment Share on other sites More sharing options...
69dejavue Posted February 1, 2008 Author Report Share Posted February 1, 2008 I wish SAI would offer this as an option. Amy, Bud, et al , are you listening? Link to comment Share on other sites More sharing options...
csm198 Posted February 21, 2008 Report Share Posted February 21, 2008 i do not no the dr. shaft speed but if you are not racing then there is not really any reason for changing the shaft unless you want quicker accerleration from takeoff. the biggest advantage to the swap is that the aluminum shafts are about half the weight of the steel shafts and this makes the shafts turn more freely.most companies advertise you can get about a tenth of a second better time in the quarter.i called coast driveline in calif. and they said they have no clearance issues with there four inch shaft.the price of the shaft is about 700.00 bucks.with our shelbys being lowered you also havr to buy for about 300.00 a part that that you attach to the rear which is some type of link that keeps the shaft from running at an angle. i am comtemplating having this done .the reason why we have a 2 piece shaft is because of the vibration. coast told me there is no vibration on there aluminum shafts and they race there cars. good luck. I cant get the 4" DS to clear! Link to comment Share on other sites More sharing options...
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