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Author Topic:   T-bird suspension
fastfrank
Dirt Roller

Total posts: 15
posted February 13, 2003 07:11 PM
I already know scrap it and get a Bow-Tie. On the serious side I have many questions on Tires and wheels, and suspentions. My car is an 86 T-Bird w/ 351w C6 Trans. I'm racing on 1/2 mile bank. I'm really not sure on how set up the car. Anyone the can help me get started I'd really be thankful.

Frank

hiersraceing
Dirt Roller

Total posts: 18
posted February 13, 2003 08:28 PM
hey fellow t-bird racer, im building a 85 t-bird and using a A-frame suspension for the front-end, i cut out just enough of the original front end to put in a piece of angle iron to hold the A-frame.....and used some old continetal spindales that already have the 5 lug pattern and have 1/2" lugs...also found an old 9" rear-end at a junk yard..........any questions please feel free to email me

dirtracer7
Dirt Maniac

Total posts: 106
posted February 14, 2003 11:56 PM
You might talk with people at the track you plan on runnin that run fords.Thats where I got alot of info building the car.Don't listen to the scrap it crap.

STREET16
Dirt Full Roller

Total posts: 32
posted February 18, 2003 07:14 PM
I would need to know what your track rules allow first. The fords down here use the mid 80's LTD/marquis frame, either all of it or the front stub. It's a front steer, the earlier, rear steer, frames tend to bend tie-rods.

fastfrank
Dirt Roller

Total posts: 15
posted February 18, 2003 08:50 PM
The track rule say that you must tie the front and rear sub frames together. I did that with 2x4 steel. The track is a 1/2 mile oval banked. I'm tring to figure out the springs, shocks,& wheel sizes.
quote:
Originally posted by STREET16:
I would need to know what your track rules allow first. The fords down here use the mid 80's LTD/marquis frame, either all of it or the front stub. It's a front steer, the earlier, rear steer, frames tend to bend tie-rods.


STREET16
Dirt Full Roller

Total posts: 32
posted February 19, 2003 08:01 PM
86 thunderbirds have mcpherson strut front suspensions and leaf spring rears. I don't have a clue where to look for strut components - they are not allowed in any of our classes. If you find them, a good baseline for springs is LF-#1000, RF-#1200, LR-#200, and RR-#225. Check with local drivers to see what they are running, and remember you can stiffen a coil spring with spring rubbers or by cutting them - you can't make the softer, you can make a multi-leaf softer by removing a leaf. Shocks are going to depend more on track conditions, I would recommend buying adjustable shocks and fine tune for your track. I apologize, for misunderstanding your question, I somehow got the idea that you were planning to swap out the front.

fastfrank
Dirt Roller

Total posts: 15
posted February 19, 2003 09:59 PM
Is it posible to swap out front ends? and how?
86 thunderbirds have mcpherson strut front suspensions and leaf spring rears. I don't have a clue where to look for strut components - they are not allowed in any of our classes. If you find them, a good baseline for springs is LF-#1000, RF-#1200, LR-#200, and RR-#225. Check with local drivers to see what they are running, and remember you can stiffen a coil spring with spring rubbers or by cutting them - you can't make the softer, you can make a multi-leaf softer by removing a leaf. Shocks are going to depend more on track conditions, I would recommend buying adjustable shocks and fine tune for your track. I apologize, for misunderstanding your question, I somehow got the idea that you were planning to swap out the front.[/QUOTE]


outlawstock17
Dirt Forum Champ
Total posts: 620
posted February 19, 2003 10:07 PM
an 86 t-bird has a 4-link with coil springs in the rear, similiar to a gm metric except the rear springs are mounted on the lower control arm. fox chassis fords also have a modified macpherson strut front. an 1000 and 1100 up front and a 250 and 225 out back is a good baseline. use an 87-88 t-bird/cougar RF lower control arm. it's an 1 1/4" longer and will give the car some camber on the RF. it's a 104" wheelbase car and will like a little more crossweight than a 108". another good upgrade is to use the sn-95 mustang front spindles and brakes. it makes the track wider, has a floating hub and better brakes. i recommend a 302 block based engine unless you can set the engine back. these cars are a little nose heavy with a 351w.

gahainsey
Dirt Full Roller

Total posts: 43
posted February 20, 2003 07:35 AM
Similar rear WHEEL rates will require a stiffer SPRING rate on a fox chassis since the spring is not on the housing.

STREET16
Dirt Full Roller

Total posts: 32
posted February 20, 2003 10:54 PM
First - check your track rules before making any changes. And it is best to talk to the track officials. Just because the rules don't say you can't, doesn't mean you can. As far as changing out the front suspension, it's a torch job. What we've done down here is cut out the unibody frame, set the body on a full frame, and bolt in place. I have seen guys use the floor pan from the full frame car, because it allows the body to sit lower - but it's a ton of work. Our rules don't allow us to channel the bodies. They don't allow mcpherson struts or rack and pinion steering either, which is why we have to make the change. Most tracks don't allow this much modification in bomber/pure stock classes. As far as I know there is no "bolt-on" swap for the front suspension. One last thing to ponder, If you do the torch job on your car, there's no going back. I don't know why I thought it had a leaf spring rear, I guess I've been under a few too many cars lately.

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