Probably something is loose or worn... sorry to not be more specific, but you'll need to track it down to see WHAT is making that noise.
It could be worn struts, worn bushings, worn ball joints or tie rods. Just jack it up and find out which parts are loose.
It could be the transmission, it could be some parts under the vehicle that rub only when travelling forward.
CV joint
bad cv joint, bad wheel bearing or suspension or brake problems
A bad ball joint or tie rod end.
neck pain
A clunking noise when accelerating in your mountaineer could indicate a few potential issues. It might be due to worn or damaged drivetrain components, such as the universal joints or driveshaft, which can create noise when torque is applied. Additionally, issues with the transmission or engine mounts can also lead to clunking sounds as the vehicle shifts under acceleration. It's advisable to have a mechanic inspect it to diagnose the exact cause.
A clunking sound upon engine start-up may be caused by several issues, including a loose or damaged engine mount, which can result in excessive movement of the engine. Another potential cause could be a failing starter motor or its gear engaging improperly with the flywheel. Additionally, low oil levels or oil sludge could lead to insufficient lubrication during start-up, causing metal components to make contact and produce a clunking noise. It's advisable to have a mechanic inspect the vehicle to diagnose and resolve the issue.
You could have blown your tire or it could have gone flat.
The squeaking noise when driving forward in your 1995 4x4 Nissan pickup could be due to several factors, including worn-out suspension components, such as bushings or ball joints, that are under more strain when moving forward. It might also be related to the brake system, where a brake pad or rotor could be making contact due to misalignment or wear. Additionally, check for loose components in the drivetrain or exhaust system that may only move or vibrate under forward motion. A thorough inspection can help identify the exact cause.
A clunking noise from a 350 motor or transmission could indicate several issues, such as worn engine or transmission mounts, which can lead to excessive movement and noise. It could also be a sign of internal component wear, like a failing torque converter or damaged gears. Additionally, low transmission fluid levels or contamination could cause similar sounds. It's advisable to have a qualified mechanic inspect the vehicle to diagnose the exact cause and prevent further damage.
could be your crank shaft