250mack Posted December 18, 2022 Share Posted December 18, 2022 Looking for some help since I've been redoing my b61 from the ground up bought a chassis last year and now I finally got the cab put on I installed the steering box and ran into an issue the pitman arm will not work with the b61 steering box and I can't find one anywhere I called a couple salvage yards and no one ever got back to me thanks for any help Quote Link to comment https://www.bigmacktrucks.com/topic/70892-b61-pitman-arm/ Share on other sites More sharing options...
70mackMB Posted December 18, 2022 Share Posted December 18, 2022 Welcome to BMT 250mack. Can't help you with the pitman arm but. l'm sure someone will get on and say, "Pictures we need pictures of the B61!!!" Just watch what happens! lol .....Hippy 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70892-b61-pitman-arm/#findComment-518616 Share on other sites More sharing options...
Freightrain Posted December 24, 2022 Share Posted December 24, 2022 I have the pitman arm off my B when I converted to air assist. I don't know if they used different splines? Diameters? Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/70892-b61-pitman-arm/#findComment-518958 Share on other sites More sharing options...
250mack Posted December 26, 2022 Author Share Posted December 26, 2022 When I bought my chassis it had a pitman arm on it when i installed the cab and went to install the pitman arm it would not go on the factory box I think pitman I have is for a powersteering conversion I measured the nut and its 1 5/8 the one I have is for a 1 3/8 Quote Link to comment https://www.bigmacktrucks.com/topic/70892-b61-pitman-arm/#findComment-519103 Share on other sites More sharing options...
Freightrain Posted December 29, 2022 Share Posted December 29, 2022 My thread is 1.125. the nut is about 1 7/8" hex. Here is the whole drag link assembly hanging on a spare box I have. It is the same as what is on my truck. I had to swap everything to get the air assist bolted up. Apparently the air set up came from a lighter front axle and the joint at the spindle was not correct. I have the FA517 axle. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/70892-b61-pitman-arm/#findComment-519290 Share on other sites More sharing options...
250mack Posted December 29, 2022 Author Share Posted December 29, 2022 The steering box is the same but the rest looks different ill half to head down to the shop and check the axle number and get back to you Quote Link to comment https://www.bigmacktrucks.com/topic/70892-b61-pitman-arm/#findComment-519295 Share on other sites More sharing options...
250mack Posted December 29, 2022 Author Share Posted December 29, 2022 I checked the axle found it to be fa505 I had no idea there would be a difference in parts the chassis I bought had no steering box on it I used the one off the junk truck not knowing there would be a problem Quote Link to comment https://www.bigmacktrucks.com/topic/70892-b61-pitman-arm/#findComment-519301 Share on other sites More sharing options...
HarryS Posted Thursday at 10:14 PM Share Posted Thursday at 10:14 PM On 12/29/2022 at 2:53 PM, Freightrain said: My thread is 1.125. the nut is about 1 7/8" hex. Here is the whole drag link assembly hanging on a spare box I have. It is the same as what is on my truck. I had to swap everything to get the air assist bolted up. Apparently the air set up came from a lighter front axle and the joint at the spindle was not correct. I have the FA517 axle. I had a Garrison hydraulic assist power steering that worked fine but had serious leaks. I sent it out and had all new seals, o-rings and so forth put it. I also had new seals put in the hydraulic cylinder. When reinstalled there was serious wondering. The shop went back over the valve, no luck, same problem. They substituted a rebuilt one, same problem. I ended up taking the Garrison unit off to go back to manual steering. The drag link I found fits 1 1/2" balls and wouldn't you know my knuckle is 1 1/2" and the pitman arm is 1 3/4". The front axle is a FA 505 and the sector shaft at the steering box is 1.125. I came on this old post and wonder, Larry do you still the parts pictured? and if so what's diameter of the ball on the pitman arm? Quote Link to comment https://www.bigmacktrucks.com/topic/70892-b61-pitman-arm/#findComment-577073 Share on other sites More sharing options...
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