ok, i own a 1990 ford f150 XLT Lariat and i was wondering if limited-slip differentials were standard on these models? and i was also wondering if there are common problems with this trucks that i should watch out for?
here's my truck specs:
1990 ford f150 XLT Lariat, 4.9L inline 6, E4OD automatic transmission, 115,475 miles (approx.), 4x2, regular cab, everything still stock.

anything will help, thanks!

 

you need to look at the door sticker and tell us the axle code.

 

I highly doubt it has an LSD, but ya never know.

 

i doubt it has a l/s.

 

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Look on the door tag and tell us the axle code. Here is a list from a tech article on here about axle information...

Axle Decoder Chart

Code Ratio Capacity Maker Type Yr

12 2.73 3800 FORD REG 1991
17 3.25 3300 FORD REG 1971
17 3.31 3800 FORD REG 1995
18 3.08 3800 FORD REG 1991
19 3.55 3800 FORD REG 1991
25 4.10. 5300 FORD REG 1991
29 3.55 5300 FORD REG 1991
35 4.10. 6250 FORD REG 1991
36 3.73 7400 DANA REG 1980
39 3.55 6250 FORD REG 1991
45 4.10. 7400 FORD REG 1991
49 3.55 7400 FORD REG 1991
65 4.10. 8250 FORD REG 1991
69 3.55 8250 FORD REG 1991
72 4.63 11000 DANA REG 1991
73 5.13 11000 DANA REG 1991
H5 4.10. 3800 FORD LIMITED SLIP 1991
H7 3.31 3800 FORD LIMITED SLIP 1995
H8 3.08 3800 FORD LIMITED SLIP 1991
H9 3.55 3800 FORD LIMITED SLIP 1991
B5 4.10. 5300 FORD LIMITED SLIP 1991
B9 3.55 5300 FORD LIMITED SLIP 1991
C5 4.10. 6250 FORD LIMITED SLIP 1991
C9 3.55 6250 FORD LIMITED SLIP 1987
D5 4.10. 7400 FORD LIMITED SLIP 1991
F5 4.10. 8250 FORD LIMITED SLIP 1991
W5 4.10 8250 FORD LIMITED SLIP 1995

 

Notice in that list of axle codes that all the ones beginning with a letter are limited slip.

Jason

 

Also notice that only one limited slip axle (C9) was available prior to 1990.

 

so you have a 1 in 3 chance to have limited slip rear end.

you have a 66.6% chance that you have a non-slip rear end.

bad odds.

you probably do not have LS.

 

There are no production numbers there - how do you know 1/3 of them are limited slip?

I've owned five Fords now - two have been limited slip. So it must a 40% chance.

 

if you have 3 choices of rear ends, per list above, than you have a one in three chance of getting one or the other.

it does depend on how ford optioned trucks, how many trucks were made, who ordered what, etc.

 

The odds of getting a LS are directionally porportional to how many were made that way, not how many different differential options were available.

For example in 72 there were 10 paint codes available for the hemi cuda; out of 2372 of those sold only 6 were paisley, do you really think you odds of getting a paisley cuda are 1 in 10?

 

I thought they dropped the hemi after 1971.And what color is paisley???

 

You're absolutely correct. Good eye!
The example given was purely ficticious to present the point.
There were no Hemi's in 72, nor where there any convertible 'Cudas. I'm not sure about the Paisley option which was interior cloth trim, the flowery one. There were 17 paint choices I beleive.

 

Sorry you are wrong. Following your logic there are no axles except for the 17, 36, c9 before 1990 which is not true. From my 1988 Ford service manual there are the follow axles 12, 18, 19, 25, 27, 29 35, 39, 45, 49, 65, 69, 72, 73, h5, h8, h9, b5, b9, c5, c9, d5, f5, so at least that many where offered in 1988. I don't know about before that.