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What will happen if my drive shaft is too short?

I took my 1986 Chevy k5 blazer to the shop and they told me due to someone installing a lift wrong, that my drive shaft is too short. What does this mean for my transmission? Can it mess it up? Does it have to replaced right away? If it does, where can I find a cheap or used drive shaft?

It is hard to install the lift wrong unless they installed the springs backwards.
Does the vehicle vibrate when driving? If so, it is due to drive line angle.
If the drive shaft is too short, it can fall out if the rear end comes off the ground and it will fall out of the transmission at the transfer case. Then the fluid will drain out and make a mess. As long as you shut it down as soon as it happens, nothing major will happen.
Blazers are known for short drive shafts and steep angles when lifted. I have owned way too many K5’s over the years (as many as 3 at a time) and have always lifted them. I have never had to lengthen the drive shafts, but I also do not lift them more than 6″.
I had a 74 on 35’s with a 406 under the hood and I broke drive shafts all the time, but never had one fall out due to it being too short (4 low front hubs unlocked drag racing light to light is hard on a Blazer and KILLS U joints)

I would recommend you get another opinion before you waste your money

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