When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Bottom end generally means crank/shell wear, put the car on concrete get someone to gently blip the throttle just above tickover you will feel the vibration from the wear if this is the case, failing that steep hill high gear, see if it starts clanking.
tabetha