Your D100 came with a 8 1/4 axle
Look at the rear lower end of the engine
sure grip
Replacing a rear differential seal is easy. All you have to do is unbolt the shaft and take out the old seal.
To remove the rear axle on a 1988 Dodge D100, start by safely lifting the vehicle and securing it on jack stands. Remove the rear wheels and brake components, then disconnect the driveshaft from the axle. Next, unbolt the axle housing from the differential, and finally, carefully slide the axle out from the housing. Ensure you have a fluid catch pan to collect any differential fluid that may spill during the process.
IF THIS A SMALL BLOCK LA V8 ENGINE, THE OPS IS PROBABLY LOCATED AT THE REAR OF THE BLOCK NEXT TO THE DISTRIBUTOR ASSM.
You have to remove the tranmission and the flywheel.
You remove the trans and flywheel. The seal then drives in from the rear.
If you have to ask, the answer won't help you.
Most are located inside the rear section of the alternator Dodge usually mounted the regulator in the center of the firewall, until the trucks were fuel injected then the computer took over the job of voltage regulator.
rear main seal leaking
To lower a 1974 Dodge D100, you can use a combination of drop spindles, lowering springs, and possibly shorter shocks to achieve the desired ride height. Another option is to use a flip kit for the rear suspension, which involves relocating the rear leaf springs to a lower position. Additionally, you can consider adjusting the suspension geometry to maintain ride quality and handling. Always ensure that the modifications comply with local regulations and safety standards.