need help with a masterbilt four bar

[m4racing]

i have a 98 masterbilt been updated to a 2001,[ its my first late model ] I've race it four times the problem is it won't get on the bars at all tried everything that i know. done move the jay bar down and the bars up , the rear spings are both 275 lbs each

[rcmaster]

make sure you have nothing in front of housing on lr,also soften lr spring and rf spring but rf on that model cant be softer than about 350. more info on bar angles ,bite , and oter springs would help

[dchamp3]

How about a 200 lr 225 rr. need to get a hold of MasterSbiltracer he will know.

[Matt49]

Post more setup information - percentages, springs, shocks, LR configuration, 4-bar angles, j-bar location at both ends.
Do you have ballast on the car and if so how much and where is it mounted?
Is it possible your drive shaft is bottoming out in the transmission? This will limit travel.
Have you checked for binds in the rest of the rear suspension?

[jedclampit]

Is the lr able to drop down w/a jack under frame? If not you may need some shock extensions or relocate the lr mount up top.

Get them 275's out, a 225 or 200 will make a big difference! Best bet, start with a pair of 225's across the rear.
What springs in front?

[MasterSbilt_Racer]

Wide or narrow? What is distance between the birdcage and underside of lr frame rail when you jack the car up under the seat and get the lr tire off the ground? Shoot for 13.25"

If you have two shock mounts on the chassis for the lr front shock, make a piece of retangle that bolts into the two shock mounts and weld a shock mount to the bottom of that piece. Lower your mount about 2". Then you won't need a shock extention and the car will respond to lowering that mount anyway.

[m4racing]

first , thanks for all the respones, this is all the info that i know,the car wieghs 2256lbs cross wiegh is 1125lbs, lf 594,rf 502,lr 623,rr 537, motor is all steel 388 dino at 556hp, the LF spring is a 10" 500lb a pro shock , the RF spring is a10" 550 lb afco 1373-7 the LR spring is a 12" 275lb afco 1395-3, the RR spring is a 14" 275lb afco no number on that shock and the LR does have a dummy shock on it , the jay bar is in the top hole on the frame and the bottom hole on the rear end on a 7 degree angle and the pinon is also a 7 degree angle [the LR bars ]the top is 19 degree and the bottom is 18 degree ,[ the RR bars] the top is 16 degree and the bottom is 6 degree, the LR bars is up all the way , and I can put a jack under the car and the LR does move forward and the bird cages does move freely, now knowing what the ride height is, I dont know how to check that.

[m4racing]

I went and checked the measurement on the LR when the car is jacked up, it measured 12" from the top of the LR bird cage to the bottom of the frame and the drive shaf still has 3" to move in the bert, the measurement between the bird cages is 37"

[MasterSbilt_Racer]

How do you have 18 degrees in the lr lower bar? I was unaware that was even possible. That should be about 5 to 7.

Can you get more angle in both uppers?

Try 500 lf 450 rf
225 lr and 225 rr

fix the drop on the lr.

You measured from the "sleeve" part of the cage to the underside of the frame, correct?

[m4racing]

I went back and talk to the guy I bought this thing off of he said it use to have leafs on it and someone welded brackets to make it a four bar car , I will lower the LR bottom bar down as far as i can , and yes that is how i measured the distant between the bottom of frame and the top of the sleeve 12" and I forgot about the fifth coil its a 300lb 12" spring and the shock an afco with no number I'll change some springs and add the shock extension to the LR maybe then I can drive this thing, who knows might make it back into a racecar LOL. and thanks for all the info at lease I have a direction to go in

[jedclampit]

A picture of what you have in the rear, 4 link brackets and birdcages may get you a lot of very useful help.

[m4racing]

I change my jay bar and loweres my LR bottom bar and added shock extenders and raised the RF ride height and changed the LR shock, for the first time it got on the bars some, not a hole lot but enought it made it fun to drive, I'm going to scale my masterbilt (I can say that now) one day this week to see where it really at. From the M 4 racing team Thanks for all the help.

[jedclampit]

Its MasterSbilt.
Good luck to ya!