BW 35 Vs BW 65

[Hantsdave]

Hi All,

Being new to this Stag thing can anyone tell me the difference between a BW35 and a BW65? I am assuming the BW stands for Borg Warner. I know the 35 is a 3 speed box, is the 65 3 speed also but with different ratios or something?

In ignorance,

Dave.

[Kevin Garrod]

imported post

Hi

Dave

the bw 65 was fitted to later Stags, it is still a 3speed auto box and is very similar to the 35. according to my haynes manual the torque convertor is slightly different (1:1 to 2:1 and 1:1 to 1.91:1)

they are interchangeable as long as you have the correct propshaft.

that's about it!

Kevin

[torque2me]

[QUOTE=Kevin Garrod;n37661]imported post

Hi

Dave

the bw 65 was fitted to later Stags, it is still a 3speed auto box and is very similar to the 35. according to my haynes manual the torque convertor is slightly different (1:1 to 2:1 and 1:1 to 1.91:1)

they are interchangeable as long as you have the correct propshaft.

A info update on this subject 16 years later :-)

Kevin is spot on with the ratio bit. Start of Stag production, Kas Kasner insisted on the BW35 for the US market as he wanted Mercedes beating performance from a standing start at traffic lights. There is in existence a tape of the board meeting on this subject. Do we have that in the Stag archive?
yorkie

[jbuckl]

Funny :- was told that the 35 was a cost reduced version of the 65.

Leyland paid sixty five quid for the 65 and 35 quid for the cost reduced .

one has an alloy sump, the other a tin one…. Think 65 is tin.

convertor housing bolts are external on 35 but internal on 65.

35 has a banjo bolted dipstick 65 has a flared? pipe fitting

[Alacrity]

Funny :- was told that the 35 was a cost reduced version of the 65.

Leyland paid sixty five quid for the 65 and 35 quid for the cost reduced version

less funny :- believe the 65 had a front & rear pump but the 35 only a front pump.

one has an alloy sump, the other a tin one…. Think 65 is tin.

convertor housing bolts are external on 35 but internal on 65.

35 has a banjo bolted dipstick 65 has a flared? pipe fitting

BW35 was around since the mid '60's, BW65 came along in the '70's, essentially exactly the same unit in a different casing with the 2 servo's mounted in the case sides. No where near as bad for leaks as the most common leak on the 35 is the selector shaft seal & the 65 doesn't suffer from this. Converters will not interchange physically as the 65 is slightly taller, from an operational point of view I doubt you could tell the difference between the 2 TC's. As far as I am aware neither ever had a rear (tow start) pump, only the 35 ever had one, no provision for it on a 65. Some say the 65 is slightly smoother, it should be as it is a redesign but they are much of a muchness from a control point of view. They both fail in the same way!

[mole42]

My 1959 Alvis TD21 had a BW DG auto ‘box, variable up shift via a dash-mounted quadrant, and a rear pump. I’ve never heard of a BW35 with a rear pump, never seen one either.

[Alacrity]

My 1959 Alvis TD21 had a BW DG auto ‘box, variable up shift via a dash-mounted quadrant, and a rear pump. I’ve never heard of a BW35 with a rear pump, never seen one either.

They definitely had them on early models, I will have some at work I'm sure if you want to see a picture of one. All DG's had them so did all Mercedes 4 speed 4 speed units up until they wen 5 speed.

[mole42]

No worries, I’ve only seen a few and remember the pain of removing propshafts before towing!