Okay so I've got a 1988 LX 5.0 Coupe and had a transmission issue that required me to swap transmissions. So the transmission that I put into the car is out a 1990 mustang 5.0. This was an AOD to AOD swap. So got the new transmission in and took it out for a spin and noticed that the speedometer was reading way off. So at like 55mph the speedometer is reading almost 70mph. So the question I have is will having an 85mph cluster in the 88 cause this problem since the cluster in the 90's is a 140mph. Or do you think this may be a difference in gearing between the 90 car and the 88. I need to take a look at my 88 and see what gears are in the rear end, but was assuming they were 2.73. The car the replacement transmission came out of was geared for 2.73. So I thought everything would swap and the speedo would be spot on.
I'm starting to wonder if maybe the 88 has like a 3.27 gear and I'll need to swap the transmission gear. I also have a 140mph cluster that I need to install from an 89 mustang as well. Really don't want to throw money at this till I get a better idea of what I might be looking at.
I'm starting to wonder if maybe the 88 has like a 3.27 gear and I'll need to swap the transmission gear. I also have a 140mph cluster that I need to install from an 89 mustang as well. Really don't want to throw money at this till I get a better idea of what I might be looking at.