1970? chrysler 45hp 457ha

[jsz_460]

This engine is awesome starts every time and as long as I run it outa gas spray a little oil in the spark plug cylinders after the boating season. she treats me right.
the new problem I'm having is that the motor will go into gear and at about 15mph pop into neutral, Ive made all the necessary adjustments on the shift linkage and now I suspect a bad gear gear in the lower, My question is will ANY Chrysler 45hp lower unit with serial# 457 be compatible to my 1970 and are these lowers hard to find used? or new even and last but not least can my lower be fixed? jsz_460

 

[Frank Acampora]

Re: 1970? chrysler 45hp 457ha

If that is the 2 piece lower unit with spline drive and a shear pin to locate the prop, any lower from the 35-45-55 series will fit. Doesn't even matter if it is the "Hydro-Dart" (Stump-stabber) gearcase or the bullet shaped gearcase. They all will bolt right up and all have the same gear ratio.

Is it definitely popping out of gear or have you checked for a spun prop hub? When marginal, a spun hub will run well until thrust becomes enough to make it slip--then the engine will race like it is in neutral.

NEW? Even if they were available, You don't want to know the price! Rebuilt? Again, even if available, WAY too expensive! Used? Available but you don't know the condition. For a used one, ask around over at The Chrysler Crew.

HOWEVER: Before you go buying another one, take apart your existing lower unit--it's fairly simple and needs no special tools.

Look at the three drive dogs on the clutch and the forward gear. They will have the edges rounded and you CAN re-dress them square with a Dremel and a carbide bit. If the forward gear dogs are not worn, simply reverse the clutch so the relatively unworn and unused reverse dogs now mate with the forward gear. Less work if they ARE in good condition.

 

[eurolarva]

Re: 1970? chrysler 45hp 457ha

Try HERE. Free shipping if you buy it? Man that has to cost about $100 just for shipping.